广泛应用的灭火剂主要有()、()、()、()、()、()等。

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问题:

广泛应用的灭火剂主要有()、()、()、()、()、()等。

考点:聚丙烯装置操作工聚丙烯装置操作工综合练习聚丙烯装置操作工综合练习题库
题型:填空题

Peter's uncle lived in the country. Once Peter went to stay with him for a few weeks. When they went for a walk or for a drive in the car and they passed somebody ,his uncle waved. Peter was surprised and said, “Uncle George, you know everybody here. Where did you meet them all?”

“I don't know all these people,” said his uncle                

“Then why do you wave to them?” asked Peter.                 

“Well, Peter,” answered his uncle, “when I wave to someone and he knows me, he is happy. He goes on his journey with a happier heart. But when I wave to some one and he doesn't know me, he is surprised and says to himself, ‘Who is that man? Why did he wave to me?’ So he has something to think about during the rest of his journey, and that makes his journey seem shorter. So I make everyone happy.

小题1:Peter was surprised that his uncle _______

A.waved to everybody they passed

B.knew everybody there

C.said hello to everyone

D.didn't know all the people they passed小题2:“I don't know all these people” means ________.

A.I know none of these people

B.I know some of these people

C.I don't know any of these people

D.I know most of these people小题3:When Uncle George waved to his friends, they became ________.

A.worried

B.happy

C.sad

D.surprised小题4:Some people didn't know Uncle George. When he waved to them, they ________.

A.became angry with him

B.thought that he must be a friend

C.thought why he was waving to them

D.didn't look at him小题5:Uncle George waved to everyone so that ________.

A.he could make some more friends

B.he could surprise everyone

C.everyone would remember him

D.he would make everyone happy

题型:填空题

蓄电池放电是将化学能转变为电能的过程,其电流流动方向为()。

A.正极→负极→负载

B.负极→负载→正极

C.正极→负载→负极

D.负极→正极→负载

题型:填空题

如图是辣椒发育成果实的过程图.请根据图回答下列问题:

(1)从花的结构看,辣椒花属于   性花。

(2)辣椒花的花粉落在柱头上的过程叫做   。要结出辣椒,还要经历的另一个重要生理过程是   

(3)②和④组成了辣椒果实,可食部分④是由[  ]   发育来的。果实里②的数目较多,其原因是  。 

(4)在一棵辣椒植株上要结出多个品种的辣椒,生产实践中常采用的方法是   

题型:填空题

9471()

A.A

B.B

C.C

D.D

E.E

题型:填空题

编入货物列车中的DL1型预制梁运输专用车组规定的检查范围和质量标准是:重车运行时,与游车相邻铁路货车的专用车钩缓冲停止器应处于()状态,预制梁运输车组两外端专用车钩缓冲停止器处于非工作状态;专用车钩缓冲停止器配件齐全良好。

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