单项选择题
A.0.1mm B.0.2mm C.0.3mm D.0.4mm
A.0.55～O.7mm B.0.61～0.8mm C.0.67～0.9mm D.0.67～O.9mm
A.120～150℃ B.140～170℃ C.160～190℃ D.190～210℃
A.≥53HRC B.≥55HRC C.≥57HRC D.≥59HRC
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