謝謝8老師的熱心回答。申請F-1就會revoke B-2簽證嗎？我聽說B-2 和 F-1 簽證是互不幹擾的。見如下的說明。
如果政策變了，懇請指正。
http://santodomingo.usembassy.gov/atc-090316.html
Can I have more than one non-immigrant visa at a time? If I apply for a student visa, do I have to cancel my B1/B2 visa?
March 16, 2009
It is possible to have more than one non-immigrant visa at the same time. This is because different non-immigrant visas are issued depending on the purpose of travel - for things like study, business, tourism or temporary work.
The most frequently issued non-immigrant visa class - a B1/B2 visa - entitles the holder to visit the U.S. for the purposes of tourism or business. However, this type of visa does not allow the visa holder to study in the United States, as this is a different travel purpose. If someone who has a B1/B2 visa wants to study in the U.S., they will need to apply for an F1, J1 or M1 visa. When such a person applies for the student visa, their tourist visa is not cancelled.
Travelers should remember that the purpose of their travel determines the class/type of their visa. A person can have more than one visa in their passport if they have more than one reason that they are traveling to the United States. The traveler must enter the U.S. on whichever visa is valid for their purpose of travel at any given time
