大流量、小扬程的泵比转速小,小流程、大扬程的泵比转速大。
参考答案:错
---What can I do for you?---Well,I’m afraid the box is heavy for you,but thank you all the same.
A.so
B.much
C.very
D.too
划分物料信息时间界面称为时间分段法。( )