约见信从哪里看签证类型？
从邀请人的信息中可以看出来，但邀请人一般都不会写出来（除非你给签证官提供充分的理由） 比如这个邀请函，就是B1/B2的visa： 如果我邀请的人申请的是F1留学的话，我会这样写： I hereby invite [name] to visit our university from November 1， 2016to December 31， 2016 as an international student. If you require more information about the purpose and details of this trip， please feel free to contact me. Please accept my kind invitation for a business talk during her time in Boston or provide any further assistance that may be required. Thanks！
再比如这个邀请函，是H-1B的visa： The Company would like to extend an invitation to Ms XXX to join us on temporary assignment as a Computer Programmer from October 8， 2015 through January 7， 2016. This request is made pursuant to Section 101(a)(15)(H)(i)of the Immigration and Nationality Act (Act)， which provides generally for T visa classification for aliens employed as specialty occupation workers. As such， we have filed documentation demonstrating both employment and labor conditions sufficient to protect the alien employer and U.S. workers. We are requesting that Ms XX be issued H-1B status with an approved petition filed by our firm． If you should need additional information regarding the abovementioned matter，please do not hesitate to ask．Thanking you again for your attention～
这种就不太能看出来是什么类型的visa了~ 因为只是简单的介绍了下申请流程以及公司的基本情况而已；而且如果是工作签证H1b的话，基本都会这么写的。
以上。