消防给水系统按压力分类有()。
A、高压消防给水系统
B、临时高压消防给水系统
C、独立高压消防给水系统
D、低压消防给水系统
参考答案:A, B, D
— that he managed toget the information?
— Oh, a friend of his helped him. [ ]
A. Where was it
B. What was it
C. How was it
D. Why was it
变速器竣工验收时,应进行()试验。
A.有负荷
B.无负荷
C.热磨合
D.无负荷和有负荷