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请问8老师：

AOS费交了之后，是不是还要交IV费？
-Right. Pay it at this website:
https://ceac.state.gov/ctrac/invoice/signon.aspx

这两者不是一回事？
-Correct. Read this:
http://travel.state.gov/content/visas/english/immigrate/immigrant-process/documents/fees/nvc-fee-payment-faqs.html

我以为我弄清楚了，现在又迷糊了。感谢8老师！