我是学理论物理的。是不是签证特别难签，经常要被check?
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厚仁杨老师
你好，一般来说留美被check多是较的敏感专业，比如：生物、化学、物理、医学、重工类、CS、AI等。如果是以上较敏感专业，签证申请及预约一定要尽早，预留出充足时间以防被check或拒签。
whoji老师
你好。具体看你的研究方向。一般有一定几率被check。被check的话通常2-4周就可以被clear，无须太多担心，就是在安排行程要合理安排，取提前量。