在这个全球化的大背景下，越来越多的人选择走出国门，去追寻更广阔的天地。而签证，无疑是开启这段旅程的关键。今天，我们就来聊聊“专业签证”这个话题，看看如何轻松办理，让你的跨境之旅无后顾之忧。

一、什么是专业签证？

我们先来了解一下什么是专业签证。专业签证是指为从事特定职业、学习、工作、投资、旅游等目的而签发的入境许可。根据不同国家和地区的规定，签证的种类繁多，如旅游签证、工作签证、留学签证、商务签证等。

二、如何办理专业签证？

接下来，我们来看看如何办理专业签证。以下是一个简单的流程：

1. 确定签证类型：根据你的出行目的，选择合适的签证类型。例如，你想去美国旅游，那么就需要申请美国旅游签证；如果你想去英国留学，那么就需要申请英国留学签证。

2. 准备材料：根据签证类型，准备相应的申请材料。以下是一些常见的申请材料：

材料名称	说明
护照	有效期至少还有6个月以上，且有至少两页空白签证页的护照。
照片	近期免冠彩色照片，规格符合要求。
签证申请表	填写完整的签证申请表。
身份证明材料	如户口本、身份证、结婚证等。
工作证明	如在职证明、劳动合同、营业执照等。
资金证明	如银行存款证明、工资单等。
行程安排	如旅行计划、酒店预订、往返机票等。

3. 预约签证面试：部分国家需要预约签证面试。可以通过官方网站或预约电话进行预约。

4. 参加签证面试：按照预约的时间，参加签证面试。面试官会根据你的情况询问相关问题。

5. 等待签证结果：面试结束后，等待签证结果。一般情况下，签证审批时间为5-15个工作日。

6. 领取签证：签证批准后，领取签证。

三、办理专业签证的注意事项

1. 提前准备：签证申请是一个复杂的过程，需要提前准备。建议至少提前3个月开始准备。

2. 真实填写信息：签证申请表中的信息要真实填写，不得伪造或隐瞒。

3. 诚实回答问题：在签证面试中，要诚实回答面试官的问题，不要撒谎。

4. 遵守签证规定：获得签证后，要遵守签证规定，不得逾期停留或从事与签证目的不符的活动。

5. 关注签证政策变化：签证政策会随时发生变化，要关注相关信息，以免影响出行。

签证是跨境之旅的通行证，办理专业签证需要我们提前准备、认真对待。只要掌握了正确的办理方法，相信你一定能够轻松办理签证，开启你的精彩旅程。祝你一路顺风！

美国签证办理敏感专业

办理签证的人很多，其实不同专业的学生或人士办理签证可能会有不同的影响，关于签证办理的敏感专业有哪些呢?不少人对此比较感兴趣，和一起来看看美国签证办理敏感专业!欢迎阅读。

美国签证办理敏感专业

在申请美国签证的时候，申请人如果所处的敏感行业或者学习的敏感专业，都会加大被拒签的可能性，这部分申请人一般都会被行政审核，领馆需要做背景调查，而且批下来的签证有效期有可能只为1年有效期。

申请美国签证常见的敏感专业列表

传统武器

核技术

导弹/导弹技术

飞机和导弹推进和车辆系统

导航和指导控制

化学与生物工程

远程成像和侦察

先进的计算机/微电子技术

材料技术

信息安全

激光与直接能源系统技术

传感器和传感器技术

船舶技术

机器人技术

申请美国签证常见的敏感专业详细说明

CONVENTIONAL MUNITIONS(传统武器):

Technologies associated with warhead and other large caliber projectiles, reactive armor and warhead defeat systems, fusing, and arming systems.

NUCLEAR TECHNOLOGY(核技术):

This section covers technologies associated with the production and use of nuclear material for both peaceful and military applications. Included are technologies for enrichment of fissile material, for reprocessing irradiated nuclear fuel to recover produced platinum, production of heavy water for moderator material, plutonium and tritium handling, as well as certain associated technologies related to high energy physics. It includes research and poser reactors, breeder and production reactors, fissile or special nuclear materials; uranium enrichment, including gaseous diffusion, centrifuge, aerodynamics, chemical, electromagnetic isotopic separation(EMIS) laser, isotopic separation(LIS); spent fuel reprocessing, plutonium, mixed oxide nuclear research, inertial confinement fusion(ICF), magnetic confinement fusion, plasma, nuclear fuel fabrication including mixed oxide(uranium-plutonium) fuels(MOX), heavy water production, tritium production and sue, electromagnetic pulse(EMP); hardening technology.

MISSILE/MISSILE TECHNOLOGY(导弹/导弹技术):

Technologies associated with air vehicles and missile systems. The technology needed to develop a satellite launch vehicle is virtually identical to that needed to build a ballistic missile. Technologies include rocket systems, ballistic missiles, space launch vehicles and sounding rockets and unmanned air equipment and reentry vehicles.

AIRCRAFT AND MISSILE PROPULSION AND VEHICULAR SYSTEMS(飞机和导弹推进和车辆系统):

The propulsion technologies included are associated with near-earth super and hypersonic flight propulsion systems for

aircraft and missiles. Many of these technologies are dual use. Technologies include liquid and solid rocket propulsion systems; missile propulsion and systems integration; individual rocket states or staging/separation mechanism; aerospace thermal and high-performance structures; propulsion systems test facilities.

NAVIGATION AND GUIDANCE CONTROL(导航和指导控制):

These capabilities directly determine the delivery accuracy and lethality of both unguided and guided weapons. The long-term costs to design, build and apply these technologies have been a limiting proliferation factor. Technologies include those associated with internal navigation systems, tracking and terminal homing devices; accelerometers, vehicle and flight control systems.

CHEMICAL AND BIOTECHNOLOGY ENGINEERING(化学与生物工程):

Of specific concern is the ability to develop, produce, and disseminate toxic chemicals, biological and toxin agents. The technologies that could be applied to produce chemical and biological agents are used widely by civilian research laboratories and industry; these technologies are relatively common in many countries. Advanced biotechnology has the potential to support biological weapons research. Look for technologies associated with bacteriology(especially pathogenic), mutagens, mycology, neurotoxins, reconbiant technology, toxins, venoms, virology, precursor chemicals, toxicological research, chemical production equipment.

REMOTE IMAGING AND RECONNAISSANCE(远程成像和侦察):

Remote sensing technologies are inherently dual-use; technologies can be used for civilian imagery projects or for military reconnaissance efforts. Drones and remotely piloted vehicles enhance reconnaissance abilities. These are technologies associated with remote sensing satellites; imagery systems; high resolution cameras and optics; air vehicles; remotely-piloted vehicles, drones.

ADVANCED COMPUTER/MICROELECTRONIC TECHNOLOGY(先进的计算机/微电子技术):

Advance computers and software play a useful(but not necessarily critical) role in the development and deployment of missiles and missile systems, and in the development and production of nuclear weapons. Advance computer capabilities are also used in over-the- horizon targeting, airborne early warning targeting, electronic countermeasures(ECM) processors. These technologies are associated with supercomputing, hybrid computing; speech processing/recognition systems; neural networks; data fusion; quantum wells, resonant tunneling; superconductivity; advance optoeletronics, acoustic wave devices, superconducting electron devices, flash discharge type x-ray systems; frequency synthesizers; microcomputer compensated crystal oscillators.

MATERIALS TECHNOLOGY(材料技术):

The metallic, ceramic, and composite materials are primarily related to structural functions in aircraft, spacecraft, missiles, undersea vehicles, and propulsion devices. Polymers provide seals and sealants for containment of identified fluids and lubricants for various vehicles and devices. Selected specialty materials provide critical capabilities that exploit electromagnetic absorption, magnetic, or superconductivity characteristics.. These technologies are associated with advance metals and alloys; non-composite ceramic materials, ceramic, cermet, organic and carbon materials; polymeric materials; synthetic fluids; hot isostatic densifications; intermetallic; organometals; liquid and solid lubricant; magnetic metals and superconductive conductors.

INFORMATION SECURITY(信息安全):

Technologies associated with cryptography and cryptographic systems to ensure secrecy for communications, video, data and related software.

LASERS AND DIRECTED ENERGY SYSTEMS TECHNOLOGY(激光与直接能源系统技术):

Lasers have critical military applications, including incorporation in guided ordnance such as laser guided bombs and ranging devices. Directed energy technologies are used to generate electromagnetic radiation or particle beams and to project that energy on a specific target. Kinetic energy technologies are those used to impart a high velocity to a mass and direct it to a target. Directed energy and kinetic energy technologies have potential utility in countering missiles and other applications. Look for technologies associated with atomic vapor laser isotope separation(AVLIS), molecular laser isotope separation(MLIS); high energy lasers(HEL), low energy lasers(LEL), semiconductor lasers, free electron lasers, directed energy(DE), kinetic energy(KE) systems, particle beam, beam rider, electromagnetic guns, optoelectronics, optical tracking, high energy density, high-speed pulse generation, pulsed power, hypersonic/hypervelocity, magnetohydronynamics.

SENSORS AND SENSOR TECHNOLOGY(传感器和传感器技术):

Sensors provide real-time information and data; the side with superior sensors has a considerable advantage. Marina acoustics is critical in anti- submarine warfare; gravity meters are essential for missile launch calibration. Look for technologies associated with marine acoustics, optical sensors, night-visions devices, image intensification devices; gravity meters; high speed photographic equipment; magnetometers.

MARINE TECHNOLOGY(船舶技术):

Marine technologies are often associated with submarines and other deep submersible vessels; propulsion systems designed for undersea use and navigation and quieting systems are associated with reducing detectability and enhancing operations survivability. Look for technologies connected with submarines and submersibles, undersea robots, marine propulsion systems; signature recognition; acoustic and non-acoustic detection; acoustic, ware, radar and magnetic signature reduction, magnetohydrodynamics; stirring engines.

ROBOTICS(机器人技术):

Technologies associated with artificial intelligence, automation, computer-controlled machine tools; pattern recognition technologies.

以上是我精心整理的美国签证办理，谢谢浏览。

签证有哪些种类

各国签证的种类多又不尽相同。根据持照人所持证件和访问事由不同，一般将签证分为外交签证、公务（官员）签证和普通签证三种。有的国家将签证分为移民签证和非移民签证两种；有的国家根据来访者的事由将签证分为旅游、访问、工作、学生、定居等签证。

一些国家还设有礼遇签证。中国签证分为外交签证、公务签证、普通签证和礼遇签证四种。现在分别介绍如下：

（一）外交签证

外交签证（Diplomatic Visa）是一国政府主管机关依法为进入或经过该国国境应当给予外交特权和豁免的人员所颁发的签证。外交签证一般发给持外交护照人员。签证颁发国依据本国法规和国际惯例，给予持证人相应的方便、优遇、特权和豁免。

中国外交签证发给外国驻华外交代表机关和领事机关的外交代表和领事官员、联合国系统组织驻华机构持红皮通行证的人员及他们的配偶和未成年子女；持用外交护照、联合国红皮通行证临时因公来华的人员及他们的随行配偶和未成年子女；

因公来华的建交国副部长及副部长以上的官员、国会（众议院、参议院）议长、副议长及他们的随行配偶和未成年子女；联合国系统组织驻华机构人员中部分持用联合国蓝皮通行证官员及他们的配偶和未成年子女；外交部或外交部领事司（局）通知发给外交签证的人员。

（二）公务签证

公务签证（Service Visa）是一国政府主管机关依法为进人或经过该国国境应当给予公务人员待遇的人士所颁发的签证。有的国家将该种签证称为官员签证（Official Visa）。公务签证一般发给持公务护照人员。

中国公务签证发给外国驻华外交代表机关和领事机关的工作人员（包括持用外交护照的非外交官员或非领事官员）和联合国系统组织驻华机构持用联合国蓝皮通行证的工作人员及其随行配偶和未成年子女，但持有中国颁发的外交官证者除外；

持公务护照、官员护照和特别护照、联合国蓝皮通行证临时因公来华或过境的外国人员及他们的随行配偶和未成年子女；应邀访华的外国党政代表团中未持用外交护照的成员；驻华民间机构中持用公务护照的人员及其随行家属。

（三）官员签证

官员签证（Official Visa）是公务签证的一种，指一些国家向持有官员护照的申请人颁发的符合其官员身份的签证，其效力同公务签证。颁发官员护照的国家一般实行相应的官员签证制度。中国没有官员签证制度。中国签证机关向前来中国执行公务的持官员护照的外国官员通常颁发公务签证。

（四）礼遇签证

礼遇签证（Courtesy Visa）是一些国家政府主管机关依法为进入或经过该国国境应当给予相应礼遇的人员所颁发的签证。这些人一般是身份高但又未持有外交护照的人员或已卸任的外国党政高级官员及知名人士。

签证颁发国根据本国法规和国际惯例，给予持证人应有的尊重和礼遇。中国礼遇签证发给来华访问的卸任外国元首、政府首脑、国会议长、最高法院院长、外交部长、前驻华大使、其他高级官员、知名人士及其随行配偶和未成年子女，未持用外交护照的有影响的外国在野党领袖以及发证机关认为应发给礼遇签证者。

（五）普通签证

普通签证（Visa）是一国政府主管机关依法为进人或经过该国国境应当给予普通人员待遇的人士所颁发的签证。普通签证一般发给持普通护照或其他有效的国际旅行证件的人员。中国普通签证发给因下列事由来中国的外国人，并在签证上标明相应的汉语拼音字母：

D字签证发给来中国定居的人员；Z字签证发给来中国任职或者就业的人员及其随行家属；X字签证发给来中国留学、进修、实习六个月以上的人员；

F字签证发给应邀来中国访问、考察、讲学、经商、进行科技文化交流及短期进修、实习等活动不超过六个月的人员；L字签证发给来中国旅游、探亲或者因其他私人事务人境的人员；

G字签证发给经中国过境的人员；C字签证发给执行乘务。航空、航运任务的国际列车乘务员、国际航空器机组人员及国际航行船舶的海员及其随行家属。另外，J—1字签证发给来中国常驻的外国记者，J—2字签证发给临时来中国采访的外国记者。

（六）移民签证和非移民签证

美国将普通签证分为移民签证和非移民签证两类。

1、移民签证

移民签证（Immigrant Visa）指美国领事官员在其驻外办事处中依据美国法典第8编第12章有关条款的规定签发给符合移民条件的外国移民的签证，准持证人凭此种签证以移民身份进人美国，并在4个月内申请外籍人登记卡（Alien Registration Receipt Card），俗称绿卡（Green Card），获得在美国的永久居留权。

有资格申请移民签证和绿卡的外国人为：美国公民的直系亲属，美国公民或永久居民的亲属，美国雇主所需要的有工作技能的人和美国移民法规定的特殊移民者。由美国公民、绿卡持有者的亲戚或美国雇主和公司作为请求者（Petition）所担保的申请移民的外国人在一定条件下也可获得移民签证和绿卡。

2、非移民签证

非移民签证（Nonimmigrant Visa）指美国法典第8编第12章授权的主管官员正当地签发给任何一个符合非移民资格的外国人的一种签证。这种签证是暂时性的。美国主管当局根据申请人前往美国的不同目的，将非移民签证分为37种，每种签证均由一个英语字母和一个数字为代号。

如访问者签证（B-1和B-2）、临时性工人签证（H-1）、临时性非农业工人签证（H2B）、培训者签证（H-3）、学生签证（F-1和M-1）、交换人员签证（J—1）等。取得非移民签证，就意味着美国政府允许持证人在美国停留期间进行符合这种签证种类的活动。加拿大等接受移民的国家也颁发类似美国的移民签证和非移民签证的签证。

签证在其发展过程中有不同的形式和称谓。例如，签注式签证，印章式签证，贴纸式签证。还有机读签证，个人签证，团体签证等。

（一）签注式签证：指在有效护照上做简单的文字签注，注明准予持证人入出境的具体要求。早期的签证多采取此种形式。

（二）印章式签证：指将签证的固定格式刻在印章上，在做签证时，将印章盖在申请人护照或其他旅行证件的签证页上，并填上必要的内容。全部过程由手工操作。随着技术的进步，改用签证机代之，或用电脑按固定格式将签证的内容打印在护照上。

（三）贴纸式签证：贴纸式签证是将签证的内容按照固定的格式做在签证专用纸上，用不粘胶将做好的签证贴在申请人的护照上。贴纸签证通常是用计算机打印制作。美国的贴纸签证还将申请人的照片扫描在签证纸上。加拿大的贴纸签证上无申请人的照片，但附有防伪标记，并用塑封技术将此部分塑封。

（四）另纸签证：另纸签证指做在与护照或护照代用证件分离的单页纸上的签证，是签证的一种特殊形式，必须与申请人所持的护照或证件同时使用。另纸签证颁发的对象一些国家有不同的规定。例如，前苏联曾规定，除外交签证做在外交护照上外，为持其他种类护照的申请人颁发一种“三联单”式另纸签证，随护照同时使用。

中国的另纸签证则颁发给签证机关认为不适宜在护照上做签证的申请人。这类另纸签证的下方须加签“本签证须与XX号XX国护照同时使用”；发给一些未建交国人员的另纸签证，其下方须加签“本签证系发给XXX先生（女士）”，这里的姓名一定要与持照人护照上的姓名完全一致。

（五）机读签证：机读签证（Machine Readable Visas-MRV）指适于用机器阅读的签证。国际民航组织机读旅行证件咨询部在机读护照技术要求的基础上，开发和制定用机器阅读和识别签证的技术要求，以实现用机器阅读签证的目标，为简便国际旅行手续提供新的技术手段。

（六）电于签证：一些国家还利用计算机网络和磁卡技术，开发并试用“电子签证”或称“隐形签证”。澳大利亚和新加坡等国家和地区在试用这种签证。

（七）个人签证与团体签证：个人签证指在每一个申请人的个人护照或其他旅行证件上做的签证。团体签证指做在一个团体名单或团体护照上的签证。中国的团体签证一般发给九人以上的外国旅游团或随船海员团体。

持同一团体签证的人员必须随团同行，一同人出境。如持团体签证的个人有特殊原因必须单独活动，应申请办理分离手续，由签证机关注销团体签证上分离人员的姓名，并为分离人员单独办理签证

资料来源：中华人民共和国驻哥德堡总领馆

美国签证办理敏感专业介绍

我为大家介绍美国签证办理敏感专业介绍，希望对出国留学的同学有所帮助。想了解更多留学精彩内容，为你详细解答。办理美国签证的时候，针对有些敏感专业会遭到拒签的情况，那么所谓的敏感专业是指哪些专业呢?下面我就给大家整理一下美国签证拒签容易发生的14个敏感专业。如果自己的专业或研究方向和这些相关，尽量淡化,或者想好说明和做好被check的心理准备了.

1. CONVENTIONAL MUNITIONS:

Technologies associated with warhead and other large caliber projectiles, reactive armor and

warhead defeat systems, fusing, and arming systems.

2. NUCLEAR TECHNOLOGY:

This section covers technologies associated with the production and use of nuclear material for both peaceful and military applications. Included are technologies for enrichment of fissile material, for reprocessing irradiated nuclear fuel to recover produced platinum, production of heavy water for moderator material, plutonium and tritium handling, as well as certain associated technologies related to high energy physics. It includes research and poser reactors, breeder and production reactors, fissile or special nuclear materials; uranium enrichment, including gaseous diffusion, centrifuge, aerodynamics, chemical, electromagnetic isotopic separation(EMIS) laser, isotopic separation(LIS); spent fuel reprocessing, plutonium, mixed oxide nuclear research, inertial confinement fusion(ICF), magnetic confinement fusion, plasma, nuclear fuel fabrication including mixed oxide(uranium-plutonium) fuels(MOX), heavy water production, tritium production and sue, electromagnetic pulse(EMP); hardening technology.

3. MISSILE/MISSILE TECHNOLOGY:

Technologies associated with air vehicles and missile systems. The technology needed to develop a satellite launch vehicle is virtually identical to that needed to build a ballistic missile. Technologies include rocket systems, ballistic missiles, space launch vehicles and sounding rockets and unmanned air equipment and reentry vehicles.

4. AIRCRAFT AND MISSILE PROPULSION AND VEHICULAR SYSTEMS:

The propulsion technologies included are associated with near-earth super and hypersonic flight propulsion systems for

aircraft and missiles. Many of these technologies are dual use. Technologies include liquid and solid rocket propulsion systems; missile propulsion and systems integration; individual rocket states or staging/separation mechanism; aerospace thermal and high-performance structures; propulsion systems test facilities.

5. NAVIGATION AND GUIDANCE CONTROL:

These capabilities directly determine the delivery accuracy and lethality of both unguided and guided weapons. The long-term costs to design, build and apply these technologies have been a limiting proliferation factor. Technologies include those associated with internal navigation systems, tracking and terminal homing devices; accelerometers, vehicle and flight control systems.

6. CHEMICAL AND BIOTECHNOLOGY ENGINEERING:

Of specific concern is the ability to develop, produce, and disseminate toxic chemicals, biological and toxin agents. The technologies that could be applied to produce chemical and biological agents are used widely by civilian research laboratories and industry; these technologies are relatively common in many countries. Advanced biotechnology has the potential to support biological weapons research. Look for technologies associated with bacteriology(especially pathogenic), mutagens, mycology, neurotoxins, reconbiant technology, toxins, venoms, virology, precursor chemicals, toxicological research, chemical production equipment.

7. REMOTE IMAGING AND RECONNAISSANCE:

Remote sensing technologies are inherently dual-use; technologies can be used for civilian imagery projects or for military reconnaissance efforts. Drones and remotely piloted vehicles enhance reconnaissance abilities. These are technologies associated with remote sensing satellites; imagery systems; high resolution cameras and optics; air vehicles; remotely-piloted vehicles, drones.

8. ADVANCED COMPUTER/MICROELECTRONIC TECHNOLOGY:

Advance computers and software play a useful(but not necessarily critical) role in the development and deployment of missiles and missile systems, and in the development and production of nuclear weapons. Advance computer capabilities are also used in over-the- horizon targeting, airborne early warning targeting, electronic countermeasures(ECM) processors. These technologies are associated with supercomputing, hybrid computing; speech processing/recognition systems; neural networks; data fusion; quantum wells, resonant tunneling; superconductivity; advance optoeletronics, acoustic wave devices, superconducting electron devices, flash discharge type x-ray systems; frequency synthesizers; microcomputer compensated crystal oscillators.

9. MATERIALS TECHNOLOGY:

The metallic, ceramic, and composite materials are primarily related to structural functions in aircraft, spacecraft, missiles, undersea vehicles, and propulsion devices. Polymers provide seals and sealants for containment of identified fluids and lubricants for various vehicles and devices. Selected specialty materials provide critical capabilities that exploit electromagnetic absorption, magnetic, or superconductivity characteristics.. These technologies are associated with advance metals and alloys; non-composite ceramic materials, ceramic, cermet, organic and carbon materials; polymeric materials; synthetic fluids; hot isostatic densifications; intermetallic; organometals; liquid and solid lubricant; magnetic metals and superconductive conductors.

10. INFORMATION SECURITY:

Technologies associated with cryptography and cryptographic systems to ensure secrecy for communications, video, data and related software.

11. LASERS AND DIRECTED ENERGY SYSTEMS TECHNOLOGY:

Lasers have critical military applications, including incorporation in guided ordnance such as laser guided bombs and ranging devices. Directed energy technologies are used to generate electromagnetic radiation or particle beams and to project that energy on a specific target. Kinetic energy technologies are those used to impart a high velocity to a mass and direct it to a target. Directed energy and kinetic energy technologies have potential utility in countering missiles and other applications. Look for technologies associated with atomic vapor laser isotope separation(AVLIS), molecular laser isotope separation(MLIS); high energy lasers(HEL), low energy lasers(LEL), semiconductor lasers, free electron lasers, directed energy(DE), kinetic energy(KE) systems, particle beam, beam rider, electromagnetic guns, optoelectronics, optical tracking, high energy density, high-speed pulse generation, pulsed power, hypersonic/hypervelocity, magnetohydronynamics.

12. SENSORS AND SENSOR TECHNOLOGY:

Sensors provide real-time information and data; the side with superior sensors has a considerable advantage. Marina acoustics is critical in anti- submarine warfare; gravity meters are essential for missile launch calibration. Look for technologies associated with marine acoustics, optical sensors, night-visions devices, image intensification devices; gravity meters; high speed photographic equipment; magnetometers.

13. MARINE TECHNOLOGY:

Marine technologies are often associated with submarines and other deep submersible vessels; propulsion systems designed for undersea use and navigation and quieting systems are associated with reducing detectability and enhancing operations survivability. Look for technologies connected with submarines and submersibles, undersea robots, marine propulsion systems; signature recognition; acoustic and non-acoustic detection; acoustic, ware, radar and magnetic signature reduction, magnetohydrodynamics; stirring engines.

14. ROBOTICS:

Technologies associated with artificial intelligence, automation, computer-controlled machine tools; pattern recognition technologies.

本文针对美国签证拒签容易发生的14个敏感专业进行了介绍，需要办理美国签证的同学，可以通过本文了解这些专业，看看自己的专业是否包括在内，提前做好准备，预防拒签的悲剧发生。