我是否可以在回國領取簽證前，提交1-140表格的申請？那時候，我的DS-160表格上需要說明在美國是有提交移民申請的。這是否會影響在國內的美國大使館裏L1簽證延期的批準？
不會影響。
Certain types of foreign visitors are allowed dual intent, and other categories of visitors are not. Persons with H-1B visas (for specialty workers and their spouses and minor children with H-4 visas), K visas (for fiancees or foreign spouses of US citizens and their minor children), L visas (for corporate transferees & their spouses and minor children), and V visas (spouses and minor children of lawful permanent residents) are permitted to have dual intent under the Immigration and Nationality Act.[1]
https://en.wikipedia.org/wiki/Dual_intent
