单项选择题
A.1~2mmB.2~3mmC.3~4mmD.4~5mm
A.0.1~0.2mmB.0.2~0.5mmC.0.5~1.0mmD.1~2mm
A.0.5~1.0mmB.1.0~1.2mmC.1.2~1.6mmD.1.6~2.0mm
A.HRC53~55B.YG8C.YG11D.YG15
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