回複：今天人氣真低，沒人答再問，希望這次LUCKY

第一個問題：
碩士畢業後申請了opt，博士畢業後還可以申請嗎？
yes

第二個問題：
申請H-1，需要公證大學畢業證書嗎？中國大學，美國碩士。
It depends on which degree is used for the H1 profession. If master's is in the same field for the position, master's is enough and bachelor's does not matter.

第三個問題：
考CPA，需要公證大學畢業證書嗎？
This is none of US Immigration's business and you don't need USCIS's approval for this.