A.20% B.30% C.35% D.40%
A.和 B.差 C.積 D.比值
A.已安裝的水表數(shù)與應(yīng)安裝的水表數(shù) B.應(yīng)安裝的水表數(shù)與已安裝的水表數(shù) C.運(yùn)行正常的水表數(shù)與已安裝的水表數(shù) D.運(yùn)行正常的水表數(shù)與應(yīng)安裝的水表數(shù)