bivs签证是什么的缩写？
B-1/2 Visitor Visa B类是访问签证，即visitor visa， 又根据用途和申请人不同分为两种： B1 和 B2. B-1 是一般非移民签证，用于进行短期的商务活动。它适用于前往美国参加会议、进行短期学习或进行工作面试的人；而B-2则是用来旅游及探亲访友。在美国的入境海关与边境保护局(U.S.Customs and Border Protection， CBP) 中，这些签证都统一归为B1/B2访客签证 (visitor visa)。
B-2 Visas for Tourists， Travelers & Visitors in the U.S. URL#a2
A Visitor to a Friend or Family Member's Residence is Considered to Be a Social Visit URL A business visit can be considered a "short term" one if it lasts less than six months; however， this type of work cannot produce any income. If your trip has a business purpose， but falls outside these parameters you may want to consider applying for an L-1 Intracompany transferee visa instead since there are more lenient requirements which allow for longer stays with no specific income requirement. For example， if you come on a B-1/B-2 visitor visa as a manager or executive from another branch office within the same company then upon arrival in the United States you would have three months stay limit before having to apply for a new visa. However， under the L-1 visa program such managers will not need a special approval letter called a petition by the USCIS， nor do they need to go through the Labor Condition Application (LCA) procedure when hiring employees overseas to help them operate their business in America properly. The main requirements for the L-1 visa include： being employed at least one full year out side USA， showing that the current job was developed and organized while abroad ，and proofing the proposed US job offer matches well with existing foreign jobs.
It should also be noted that both L-1 visas and B-1 / B-2 visitors must obtain advance permission from US embassy in their home country， prior to traveling so that they know how long their respective visas last once arriving into US territory. Therefore applicants will need to carefully plan their travel route according to what kind of nonimmigrant status each individual needs depending on whether they intend coming here solely for pleasure purposes using only tourist money earned during past trips