求教:水处理学术问题# Environmental - 环境科学与工程
p*7
1 楼
I have a PhD degree in Biology from US . I'm working as a Posdoc on H-1B visa. If I
want to submit I-140 for
greencard application, do I need to apply for PERM first?
Can anyone tell me what is the difference between NIW, EB1,EB2,and EB3?
Thank you!
want to submit I-140 for
greencard application, do I need to apply for PERM first?
Can anyone tell me what is the difference between NIW, EB1,EB2,and EB3?
Thank you!