单项选择题
A.1±0.5mm B.1±1.5mm C.2±0.5mm D.2±1.5mm
A.2kPa B.3kPa C.4kPa D.5kPa
A.56mm B.57mm C.58mm D.59mm
A.1 B.2 C.3 D.4
微信扫一扫,加关注免费搜题