单项选择题
A.M8 B.M10 C.M12 D.M16
A.斜铁 B.千斤顶 C.方箱 D.马镫
A.42CrMoS4调质 B.45钢发蓝 C.1.2379整体淬火 D.1.2333表面激光淬火
A.45° B.60° C.15° D.30°
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