收到普渡的RA offer, offer上写的是I-9签证,是对的吗?要怎么办?

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xjw1986
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收到了普渡的RA offer, offer上写的是I-9签证表格,如下:
This offer is also contingent upon your eligibility to work in the United States. Prior to your first day of work, you must first complete Section 1 of the U.S. Citizenship and Immigration Services Form I-9, Employment Eligibility Verification.

这个是正常的吗?以前见大家出国都是I-20。这个要怎么办呢?和一般的I20在签证办理的过程有什么区别呢?

知道这个的朋友帮帮忙啦, 十分感谢!
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