试题与答案

自动步枪枪膛里,火药爆炸产生的气体对子弹的平均推力是13000N,枪膛长30cm

题型:填空题

题目:

自动步枪枪膛里,火药爆炸产生的气体对子弹的平均推力是13000N,枪膛长30cm,子弹从枪膛射出后前进了100m,则火药爆炸产生的气体对子弹所做的功是______J.

答案:

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题型:阅读理解

Mr. Brown was going away for a week. Before he left, he said to his son, “If anyone asks for me, you can tell him that your father has been out for doing something, and will be back in a week, then be sure to ask him to sit down for a cup of tea.”

  “OK, Dad,” said his son. But he was afraid his son couldn't remember this, he wrote these words down on a piece of paper and gave it to him. His son put it into his small pocket, took it out and looked at it every now and then.

   Four days passed, but no one came to see his father. The boy thought that there was no man to come and that the piece of paper was of no more use for him, so he burnt it that evening.

  The next afternoon, someone knocked at the door. The boy opened it. A man was standing at the door and said, “Where is your father?” The boy put his hand into his pocket at once and looked for the piece of paper. He could not find it. He suddenly remembered he had burnt it, so he shouted, “No more.”

  The man was very surprised. He asked, “No more? I met your father last week. When did it happen?”

  "Burnt yesterday evening."

小题1:Mr. Brown told his son that _____.

A.he would be away from home for four days

B.he would be back in seven days

C.he would be back in a month

D.he liked a cup of tea小题2:Mr. Brown wrote the words down on ________.

A.the wall

B.the door

C.a piece of paper

D.his son's pocket小题3:A man came to visit the boy's father on ________.

A.the second day

B.the third day

C.the fourth day

D.the fifth day小题4:The man was very surprised because _________.

A.he thought the child's father was dead

B.the child didn't ask him to sit down

C.the child gave him a cup of tea

D.he couldn't find that piece of paper小题5:What was burnt? ___________.

A.The piece of paper

B.Mr. Smith

C.The visitor

D.The boy

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题型:选择题

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随着进城务工人员规模不断扩大,随迁子女完成义务教育后,继续升学考试的问题日益突出,随迁子女能否在流入地参加高考的追问愈演愈烈。日前,民众千呼万唤的《关于做好进城务工人员随迁子女接受义务教育后在当地参加升学考试工作的意见》终于出炉,1200多万进城务工人员子女终于可以参加异地高考。在因地制宜的方针指引下,各地异地高考方案原则上将由省级政府在年内制定出台。

A.愈演愈烈

B.千呼万唤

C.出炉

D.因地制宜

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题型:问答题

长时间使用的热水壶底部有一层水垢,主要成分是CaCO3和Mg(OH)2.学校化学研究性学习小组同学通过实验想测定水垢中CaCO3的含量为多少.他们取200g水垢,加入过量的稀盐酸,同时测量5分钟(min)内生成CO2质量(已知Mg(OH)2与稀盐酸反应不能放出C02气体),测量数据如下表:

时间/min12345
生成CO2的质量/g1825303333
计算:(1)3min时,水垢中的CaCO3是否反应完全?请说明理由

(2)该水垢中CaCO3的质量分数是多少?

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