超精密加工的公差尺寸精度为()
A.10um
B.10-0.1um
C.0.1-0.01um
D.0.001um
参考答案:C
–Guess what, we’ve got our visas for a short-term visit to the UK this summer.
--How nice! You a different culture then.
A.will be experiencing
B.have experienced
C.have been experiencing
D.will have experienced
治安警察是负责维护社会治安秩序,保障公共安全的人民警察。( )