单项选择题
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°
A.300 B.350 C.400 D.450
A.0.3±0.1 B.0.4±0.1 C.0.3±0.2 D.0.2±0.1
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