A.0.35% B.1% C.0.135% D.0.27%
A.缺點數(shù)就是不良品數(shù) B.缺點數(shù)不小于不良品數(shù) C.缺點數(shù)不大于良品數(shù) D.皆不正確
A.壽命 B.耐久性 C.失效率 D.不良率