回复：谢谢！那从I-140上能不能确定看出来到底是EB2还是EB3呢？

You can tell whether your I-140 is Eb2 or Eb3 from your I-140 approval notice (not I-140 receipt):

your I-140 is Eb2 if you find somehting on your I-140 approval notice as follows:

Section: Mem of Profession w/Adv Deg or Exceptional Ability Sec 203 (b)(2)

and your I-140 is Eb3 if you find something as follows:

Section :Skilled Worker or Professional Sec.203(b)(3)(A)(i) or (ii)