1.回中國時,是出示H1還是AP?
-Unless you have dependents (family memebers) whose H4 status relies on your H1, using AP is safe and convenient.
2。AP 隻有2張嗎? 回來時,要交回1張,然後自己留一張?
-Correct. The CBP officer will tell you how to do when you enter US.
3.北京H1返簽預約的電話和相關的website?
-Find it in the website of the US Consulate/Embassy in China.
4.北京H1返簽時,要帶的documents?
-copies of H1 approval notice, H1 petition materials (I-129, etc.) and a letter from your employer indicating your employment status, and your recent three month paycheck stubs (not need, but in case).
5。如果H1簽證有問題,我可以再AP回來嗎?
-Yes. See answer for your Q1.