簽證有變：美國留學敏感專業詳細列表
今年美國簽證形勢整體開始發生轉變，敏感專業的審查週期從以前的長達兩個月縮短到2~3週，且因專業審查而遭遇申請失敗的人數極少。但是，如果申請者所學的專業屬於敏感專業，為了能按時到達學校，一定要提早向所在轄區的大使館或者領事館申請簽證。美國留學敏感專業詳細列表
The State Department maintains a Technical Alert List, also known as the sensitive major list, to guide their evaluation of visa submission.
Sorted by rate.
CRITICAL FIELDS LIST
A. CONVENTIONAL MUNITIONS: Technologies associated with:
----Warheads and other large caliber projectiles
----Reactive armor and warhead defeat systems
----Fusing and arming systems.
----Electronic countermeasures and systems
----New or novel explosives and formulations
----Automated explosive detection methods and equipment
. NUCLEAR TECHNOLOGY: Technologies associated with
production and use of nuclear material for both peaceful and military applications. Included are technologies for:
----Enrichment of fissile material
----Reprocessing irradiated nuclear fuel to recover produced plutonium
----Production of heavy water for moderator material
----Plutonium and tritium handling
Also, certain associated technologies related to nuclear physics and/or nuclear engineering. Includes materials,equipment or technology associated with:
----Power reactors, breeder and production reactors
----Fissile or special nuclear materials
----Uranium enrichment, including gaseous diffusion,centrifuge, aerodynamic, chemical, Electromagnetic Isotopic Separation （EMIS）, Laser Isotope Separation （LIS）
----Spent fuel reprocessing, plutonium, mixed oxide nuclear research
Inertial Confinement Fusion （ICF）
----Magnetic confinement fusion
----Laser fusion, high power lasers, plasma,
----Nuclear fuel fabrication including Mixed Oxide （uranium-plutonium） fuels （MOX）
----Heavy water production
----Tritium production and use
----Hardening technology
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