Will international students refuse to sign my passport after returning to the American embassy for an interview in the summer vacation?

To apply for a visa to the United States, except for a clear refusal on the spot.

There are two situations where materials will be left behind.

1: I just passed the interview, but I still need to continue to review the background before I can decide whether the visa is legal.

2. Inform the visa clearly on the spot and give a note that the visa has passed.

According to the United States immigration law, 2 14(b)

Refusal means that you can't prove that your real purpose in the United States is consistent with the reasons for applying, and you can't prove that you are a "non-immigrant".