单项选择题
A.±1.5mm B.±lmm C.±2mm D.±3mm
A.±5mm B.±3mm C.±2mm D.±10
A.45°±5° B.50° C.55° D.60°±5°
A.60°±5° B.65° C.65°±5° D.70°±5°
微信扫一扫,加关注免费搜题
