单项选择题
A.(250±2)mm B.(260±2)mm C.(270±2)mm D.(280±2)mm
A.≤0.04mm B.≤0.03mm C.≤0.02mm D.≤0.01mm
A.100mm B.150mm C.200mm D.250mm
A.3 B.4 C.6 D.8
微信扫一扫,加关注免费搜题