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儿子要帮女朋友办K1， 但是他还是full time 医学院学生，没有收入，他能办理吗？怎样办理？
-Yes, but you need to provide the financial support if your child is still living with you. Read this article for more information:
http://www.nolo.com/legal-encyclopedia/free-books/fiance-marriage-visa-book/chapter3-4.html
 

他女朋友夏天来看他，是否能直接从B签证直接申请绿卡？
-Technically, yes. But there is some risk that the USCIS possibly consider she may have visa fraud. SO, They had better not get married within 3 months after she enters US using B-2 visa.