离心泵工作的必要条件是事先要给泵()。A、形成真空 B、放真空 C、灌水

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问题:

离心泵工作的必要条件是事先要给泵()。

A、形成真空

B、放真空

C、灌水

考点:二级消防工程师消防安全技术综合能力消防安全技术综合能力题库
题型:单项选择题

A lot of studends are having all kinds of spots on the spots field. A football game is going on just now____Class 3 and class 4. We don’t know which team will ______. Look at those people over there! Some students of class 1 are practicing  the _____jump. One of them is the best high jumper in the school. He practices hard every day. Many people think he will ____the school record(记录) in the sports meet next spring. Not far away from them,some girls are preparing for a race. They _____have a 600-meter race in ten minutes. Now in the corner of the field, you can see another group of students. Their teacher is telling them __to throw discus(铁饼).   In schools, _____students love sports now.  Sports help people to keep _____. They also help people to live happily. And____doing sports on the sports field , many people will  ______good friends, too. Do you think so?

小题1:

A.in

B.between

C.from

D.of

小题2:

A.win

B.winning

C.fall

D.falling

小题3:

A.long

B.far

C.high

D.tall

小题4:

A.break

B.turn

C.leave

D.name

小题5:

A.were

B.going to

C.were going to

D.will

小题6:

A.what

B.how

C.which

D.that

小题7:

A.much and much

B.most and most

C.many and many

D.more and more

小题8:

A.health

B.tired

C.healthy

D.happy

小题9:

A.in

B.before

C.after

D.over

小题10:

A.become

B.change

C.get

D.bring

题型:单项选择题

常见的网络拓扑结构有星型、环型、 【1】 和树型等几种。

题型:单项选择题

下列哪项不是洗涤剂对健康的影响()。

A.影响肝脏功能

B.影响肾上腺

C.影响免疫功能

D.影响神经系统功能

E.皮肤毒性

题型:单项选择题

在我国最常见的会发展为慢性肾功能衰竭的疾病是

A.狼疮性肾炎
B.糖尿病肾病
C.慢性肾盂肾炎
D.肾小动脉硬化症
E.慢性肾小球肾炎

题型:单项选择题

广州学生医保使用范围包括哪些?

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