单项选择题
A.5B.2C.3D.4
A.5BPNB.4BPNC.3BPND.6BPN
A.125mmB.126mmC.120mmD.110mm
A.25±0.15B.35±0.15C.15±0.15D.20±0.15
微信扫一扫,加关注免费搜题