A.磨合期B.磨合延長(zhǎng)期C.正常工作時(shí)期D.極限磨損時(shí)期
A.B/2hg≤φB.B/2hg>φC.B/hg>φD.b/2hg=φ
A.磨料磨損B.機(jī)械磨損C.腐蝕磨損D.化學(xué)磨損