單項(xiàng)選擇題

關(guān)于故障率算法以下正確的是:()

A.故障率=故障車(chē)輛數(shù)/投放車(chē)輛數(shù)
B.故障率=故障車(chē)輛數(shù)/運(yùn)營(yíng)中車(chē)輛數(shù)
C.故障率=故障車(chē)輛數(shù)/可用車(chē)輛數(shù)
D.故障率=故障車(chē)輛數(shù)/維修中車(chē)輛數(shù)

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