离心式水泵的效率是指()之间的关系。
A.有效功率与轴功率
B.有效功率与配用功率
C.轴功率与配用功率
D.有效功率与额定功率
参考答案:A
I've never read a better book than this one._____, it is the best one that I have ever read. [ ]
A. Since then
B. In other words
C. At times
D. In some ways
证治之不当,不但可转成慢性,且可加重转为:()
A.郁证
B.痴呆
C.厥证
D.狂证
E.痫证