启动离心泵前为什么要关闭泵的出口阀门?

题型:问答题 简答题

问题:

启动离心泵前为什么要关闭泵的出口阀门?

考点:化学工程化工原理化工原理题库
题型:问答题 简答题

At 9:00a.m.yesterday, bus No.26 was going along Zhonghua Road when the driver saw an old man_  _on the side of the road. A woman next to him was shouting for _  .

The bus driver,_    _Wang Ping, stopped the bus without_  _twice. He got_  _and asked the woman what happened. She said that the man had a heart problem and _  _go to the hospital. Mr. Wang knew he had to act quickly. He told the passengers that he must take the man to the hospital. He expected most or all of the passengers to get off and wait__  __the next bus. But to his_  _,they all agreed to go with him. Some passengers helped Mr. Wang to move the man_  _the bus.

Thanks to Mr.Wang and the passengers, the doctors    _the man in time.

小题1:A. lie                 B. lies                      C. lying

小题2:A. help                B. trouble                   C. problem

小题3:A. 24 years old          B.24-year-old               C.24-years-old

小题4:A.think               B. to think                  C. thinking

小题5:A.off                  B. down                    C .on 

小题6:A.may                 B. should                   C. can

小题7:A.about                B. with                     C. for

小题8:A.surprise             B. surprised                 C. surprising

小题9:A.in                   B. into                    C. onto

小题10:A.save                 B. saved                    C. saves

题型:问答题 简答题

按照《城市规划编制办法实施细则》规定,城市用地的适宜性区划中,一类用地指()。

A.用地的工程地质等自然环境、条件比较优越,能适应各项城市设施的建设需要,一般不需要或只需要稍加采取工程措施,即可用于建设的用地

B.需要采取一定的工程措施,改善条件后才能修建的用地

C.需要采取特殊工程措施后才能用作建设的用地

D.不适于修建的用地

题型:问答题 简答题

建设工程平行承发包模式的缺点是( )。

A.业主选择承包单位范围小
B.投资控制难度大
C.进度控制难度大

D.质量控制难度大

题型:问答题 简答题

开炼机混炼应控制哪些工艺条件?它们有何影响?

题型:问答题 简答题

产蛋鸡的光照原则是产蛋阶段光照时间只能缩短,不能延长,光照强度不可减弱。

更多题库