A.{1–[∑故障門數(shù)(門/線)×故障時(shí)間(mim)]/[實(shí)用門數(shù)(門/線)×全月日歷時(shí)間(mim)]}×100%
B.{1–[∑故障門數(shù)(門/線)×故障時(shí)間(mim)]/[實(shí)用門數(shù)(門/線)×全月日歷時(shí)間(mim)]}
C.{1–[∑故障門數(shù)(門/線)×故障時(shí)間(mim)]/[實(shí)際門數(shù)(門/線)×全月日歷時(shí)間(mim)]}
D.{1–[∑故障門數(shù)(門/線)×故障時(shí)間(mim)]/[實(shí)際門數(shù)(門/線)×全月日歷時(shí)間(mim)]}×100%