在我们的日常生活中涉及许多变化。下列变化中不包含化学变化的是[ ] A. 用石灰

题型:选择题

问题:

在我们的日常生活中涉及许多变化。下列变化中不包含化学变化的是 [ ]

A. 用石灰浆涂抹墙壁后,表面有水珠生成    

B. 在口中咀嚼米饭或馒头时感到有甜味    

C. 冰箱中用活性炭作吸附剂吸附异味    

D. 绿色植物的光合作用

考点:物理变化和化学变化的特征和判别
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当工程项目的实际施工成本出现了问题,只有通过( ),才能最终达到有效控制施工成本的目的。

A.检查

B.比较

C.分析

D.纠偏

题型:选择题

The hardworking businessman Jones used to work all day in his shop and so hard-working was he that at times he would make the sparks(火星) fly from his hammer.

The son of Mr. Smith, a rich neighbor, used to come to see him every day and for hours and hours he would enjoy himself watching how the man worked.

“ Young man, why don’t you try your hand to learn to make shoe tacks (钉) , even if it is only to pass the time ? ” said Jones. “ Who knows, one day, it may be of use to you .”

The lazy boy began to see what he could do. But after a little practice he found that he was becoming very skilled and soon he was making some of the finest tacks.

Old Mr. Smith died and the son because of the war lost all his goods. He had to leave home and was forced to live in another country. It so happened that in this village there were many shoemakers who were spending a lot of money buying tacks for their shoes and even at times when they paid high prices they were not always able to get what they wanted, because in that part of the country there was a high demand for soldiers’ shoes.

Our young Mr. Smith, who was finding it difficult to earn his daily bread, remembered that once upon a time he had learned the art of making tacks and had the sudden idea of making a bargain with the shoemakers. He told them that he would make the tacks if they would help to get him settled in the workshop. The shoemakers were only too glad of the offer. And after a while, Mr. Smith found that he was soon making the finest tacks in the village.

“ How funny it seems, ” he used to say, “ even making tacks can make money. My trade is more useful to me than all my former riches.”

小题1:The young man learnt to make shoe tacks because ___________.

A.his father told him to

B.he wanted to learn a skill

C.Jones encouraged him to

D.he just wanted to pass his time小题2:Which of the following is TRUE according to the passage ?

A.Old Mr. Smith enjoyed making the shoe tacks.

B.Jones had said the young man must be in need of the skill.

C.The higher prices they paid, the more tacks the shoemakers would get.

D.The young man earned his living by his skills learnt when he was young.小题3:What can we learn from the story ?

A.Practice makes perfect.

B.Skill makes life easy.

C.A good beginning makes good ending.

D.Every man has his gift.

题型:选择题

通过井下深井泵往复抽吸作用,将油层内的液体不断抽出地面是()的采油原理。

A、自喷井

B、螺杆泵井

C、抽油机井

D、电动潜油泵井

题型:选择题

已知八位机器码10111010(最高位为符号位),当它是原码时表示的十进制数是 (7) :当它是补码时表示的十进制数是 (8) ;当它是反码时表示的十进制数是 (9)

A.71

B.70

C.-70

D.69

题型:选择题

为什么勘查工程要布置成系统?

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