单项选择题
A.沟槽B.凸台C.凹形D.斜槽
A.34gB.40gC.42gD.45g
A.0.45mmB.0.50mmC.0.54mmD.0.55mm
A.0.12~0.30mmB.0.15~0.35mmC.0.2~0.30mmD.0.2~0.35mm
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