-USCIS usually do not revoke your approved NIW I-140 unless you had a problem (e.g. fraud) in your application. The employer can cancel his sponsored I-140 anytime even if it is approved.
NIW的申请,如果没有继续在原领域干,485被deny, I140还有效吗?
-Yes.
如果之后又回到原领域可以直接再申485 吗?
-Yes.