作業(yè)率是個(gè)百分?jǐn)?shù),數(shù)值大者,說(shuō)明磨礦機(jī)開(kāi)車(chē)運(yùn)轉(zhuǎn)時(shí)間長(zhǎng),反之實(shí)際開(kāi)車(chē)工作時(shí)間短。計(jì)算公式如下: