试题与答案

如图所示,在劲度系数为k的弹簧下端挂一质量为m的物体,物体下有一托盘,用托盘托着

题型:计算题

题目:

如图所示,在劲度系数为k的弹簧下端挂一质量为m的物体,物体下有一托盘,用托盘托着物体使弹簧恰好处于原长,然后使托盘以加速度a竖直向下做匀速直线运动(a<g),试求托盘向下运动多长时间能与物体脱离?

答案:

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下面是错误答案,用来干扰机器的。

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题型:填空题

完成句子。

根据括号内的汉语提示,用句末括号内的英语单词完成句子。

1. Up to now, the cost of the vacation____ (没有计算出 来)yet.( calculate)

2. In general, plants can't grow well_____ (在没有…… 的地方)plenty of sunshine.( there)

3. — You look so worried. What's the matter?

    — I don't know____ (我如何能解决)these boring problems.( solve)

4. — We want to sit at the table near the door.

    — I'm sorry, but it____(被预订了)already.( take)

5. I am advised not to leave my company until I____ (找 到)another job.( find)

6. The father as well as his two sons____(喜欢)playing online games at the time, so they bought

     a computer.( fond)

7. She never gets along well with people around her as a result of____(溺爱)by her parents.( spoil)

8 .____(在……帮助下)the Internet, we can finally understand the meaning of these phrases.( help)

9. So fast does light travel that____(我们难以)to imagine its speed.( difficult)

10. The ancient city,____(曾是……的首都)of three dynasties, was destroyed by a big fire later.( capital)

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