logo - 刷刷题
下载APP
【单选题】

离心泵的叶轮形状不同,用途也不同,( )叶轮适于含有杂质或悬浮物的物料。

A.
开式
B.
半闭式
C.
平衡式
D.
闭式
题目标签:悬浮形状离心泵
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【多选题】离心泵抽空的原因有()。

A.
启动前未灌泵
B.
进空气
C.
介质大量汽化
D.
压力过高

【单选题】Passage Two Questions 66 to 70 are based on the following passage: If an agreement signed in Germany works out, travelers of this Asian city may one day be able to move from the downtown area to its n...

A.
It is difficult to see fingerprints with human eyes.
B.
There are special ways to recover a suspect’s fingerprints.
C.
Even a small part of a fingerprint is useful for identification
D.
Suspects usually try to avoid leaving their fingerprints at the scene.

【单选题】圆柱度公差带的形状是( )。

A.
一个圆
B.
一个球
C.
两个同心圆
D.
两个同轴圆柱

【多选题】启动离心泵须确认的事项有()。

A.
有适当的润滑油
B.
进出口阀已打开
C.
泵内料液已充满
D.
联轴器上有安全盖