如图是工业电解饱和食盐水的装置示意图,下列有关说法中不正确的是( ) A.装置中

题型:选择题

问题:

如图是工业电解饱和食盐水的装置示意图,下列有关说法中不正确的是(  )

A.装置中出口①处的物质是氯气,出口②处的物质是氢气

B.该离子交换膜只能让阳离子通过,不能让阴离子通过

C.装置中发生反应的离子方程式为:2Cl-+2H+

通电
.
Cl2↑+H2

D.该装置是将电能转化为化学能

考点:电解池原理
题型:选择题

Tom and his best friend Rob were out of school for the summer. They had been swimming, gone to the movies, played video games, and even built a castle out of some old cardboard boxes. But today they were so bored. “At least we would have something to do.” Tom thought for a while and suggested, “Let’s make some popcorn and lemonade and sell it outside.”

The boys went to the kitchen and asked Tom’s mom if she would help them make some lemonade while they popped the popcorn. Tom’s mom got the lemons from the refrigerator and also a small amount of sugar. She mixed up the lemonade while the boys started popping the popcorn.

Tom and Rob got a small table from the garage and set it up near the sidewalk. They made a red sign telling everyone that popcorn and lemonade was for sale. The boys sat for about ten minutes before they got their first sale. Mrs. Jenkins, one of their neighbors, was walking her dog. “It’s so hot today.” “I sure can use a drink,” she said. Soon the boys were busy handing out popcorn to Mr. Baker. He was walking down the street sending the mail. “I need a break,” he said. “Walking all over the neighborhood gave me an appetite.”

The boys had only three popcorn bags left and enough lemonade for three more cups. “Wow, I didn’t think the popcorn and lemonade would sell that fast. We made six dollars,” said Tom. “If we get bored again before school starts, we can try selling more lemonade with cookies(饼干) next time,” laughed Rob.

小题1:What did Tom suggest?

A.Swimming with their friends.

B.Buying some sugar and cookies.

C.Making some popcorn and lemonade.

D.Going to the movies and playing games.小题2:Where did Tom and Rob set up the table?

A.Near the sidewalk.

B.In the kitchen.

C.At the supermarket.

D.Outside the school.小题3:What did Tom and Rob learn from this experience?

A.People might prefer to buy things on sale.

B.They could do something new to have fun.

C.Mr. Baker liked sending mails very much.

D.Mrs. Jenkins needed help to walk the dog.

题型:选择题

下列化学式既能表示物质的组成,又能表示物质的分子式的是 [ ]

A.NH4NO3

B.SiO2

C.C6H5NO2

D.Cu

题型:选择题

以下程序运行后的输出结果是______。
main()
int a=3,b=4,c=5,t=99;
if(b<a&&a<c)t=a;a=c;c=t;
if(a<c&&b<c)t=b;b=a;a=t
printf("%d%d%d\n",a,b,c);

题型:选择题

设计平流沉淀池的主要控制指标是()

A.流量和停留时间

B.表面负荷和停留时间

C.水温和流量

D.表面负荷和流量

题型:选择题

CRH1A型动车组IDU的系统--高压界面上,受电弓图标显示红色边框,表示()。

A.已升弓

B.降弓(或状态不明)

C.有故障并降弓

D.切除并降弓

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