A.耐磨性降低 B.疲勞強(qiáng)度降低 C.使用壽命延長(zhǎng) D.抗腐能力降低
A.Ra0.8~0.05μm B.Ra1.6~0.8μm C.Ra3.2~1.6μm D.Ra1.25~1.6μm
A.15~20 B.6~8 C.12~15 D.25~30