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Use the appropriate mailing address and mark both the envelope and the cover letter as to the form type. Example: I-129; I-130; I-690; I-698, etc.
请问这句话后半句不明白,我找到的cover letter的例子如下,但是找不到上面后半句话对应的部分,
是不是 Type of Petition: I-140就是?
-Right. The format of the sample letter you cited is OK.
另外,我没有Fax,是不是可以不写了?
-Right.