A.1~2m/min B.2~4m/min C.4~6m/min D.6~10m/min
A.螺紋長(zhǎng)度 B.每英分長(zhǎng)度 C.每英尺長(zhǎng)度 D.每英寸長(zhǎng)度
A.0.628mm B.0.942mm C.1.257mm D.1.571mm