The new car over there ___ his.
A.is
B.is belonged to
C.is belonging to
D.belongs ot
答案:A
产后出血是指胎儿娩出后24h内, * * 流血量超过
A.400ml
B.500ml
C.600ml
D.700ml
E.800ml
离心泵按泵壳结合面位置可分为()式和()式。