A.0.2~0.4mm B.0.1~0.3mm C.0.3-0.5mm D.0.1-0.6mm
A.應預報廢 B.應用油石磨平加以消除 C.應更換新件 D.應鍍鉻修復
A.0.1mm B.0.15mm C.0.2mm D.0.05mm