单项选择题
A.3~4mm B.5~8mm C.4~5mm D.5~9mm
A.铁锤 B.铜锤 C.木锤 D.钢锤
A.10s B.15s C.20s D.30s
A.钢丝刷 B.平锉 C.铜丝刷 D.砂纸
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