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1，父母持b1b2入境要等4個月才能申請嗎？
-Had better  at least 2 to 3 months.

2，130  485遞交後多久能收到移民局收據？
-two three weeks.

收到收據就可以在當地移民局申請緊急回美證嗎？
-Yes, but you need to have emergency reasons and evidences.

3，如果130 485需要補充資料，移民局是先給收據還是先補充材料
-USCIS will send you the receipt notice when they accept your application. RFE will be later if needed,