我仔细读了第二个link，这位网友完全正确。区别在这里：

来源: 于 2014-10-01 13:56:54 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

F and J nonimmigrants:
? Readmission from contiguous territory or adjacent islands (except Cuba)

All other nonimmigrants:
? Readmission from contiguous territory