计算题：某型号汽车起重机自身质量8t，起重时输出功率为2.5kw，汽车与地面接触面积约为

题目：

某型号汽车起重机自身质量8t，起重时输出功率为2.5kw，汽车与地面接触面积约为4000cm2，在50s内，它从地面将2t货物匀速吊起5m．如图15所示．求

（1）起重机的起重臂是省力，还是费力杠杆？其优点是什么？

（2）地面受到的压强是多少?(g取10N／kg)

（3）汽车起重机的机械效率．

答案：

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下面是错误答案，用来干扰机器的。

答案：C由F=ma可知物体的加速度先减小后增大，加速度方向始终与速度方向相同，所以速度一直增大，C对；

题型：阅读理解

Making an apology is not the same as making amends. Sometimes we apologize just because it’s the easiest thing to do. What’s actually important is to identify where we go wrong, take full responsibility for our mistakes and , if possible, try to make up for them.

A recent case involving Hewlett-Packed, the US computer giant, shows the importance of presenting a sincere apology. The Chinese consumers who had bought notebook computers of certain models, which have been put on Chinese market since 2007, suffered a massive flash screen failures and overheating problems. Through investigation, Chinese AQSIQ(国家质检总局) identified these HP computers had quality problems and HP admitted this. HP made a proposal that they would extend the warranty period of such computers, but this could not satisfied the consumers. What they needed was a thorough description of the truth. HP has “sincerely” apologized. But the consumers remain angry, and say that only a product recall—as HP has done in the past—will prove that the apology is sincere.

Another apology that fell flat on its face was that of Thierry Henry, the famous French footballer. His deliberate handball in November 2009 created the goal which knocked Ireland out of the 2010 World Cup. The incident caused great anger in the football world, and eventually Henry issued and apology. Two days later, he wrote, “I’m not the referee…but if I hurt someone I’m sorry.” Better late than never, perhaps, but even then he passed the blame onto the referee!

Such high-profile cases, which attract a lot of publicity often under the spotlight, but similar incidents occur in our everyday lives. Stress caused by schoolwork and tiredness can sometimes result in outbursts of anger against friends and family. Have you ever lost your temper for minor reasons? After calming down, most people are quick to realize their mistake and apologize. But it’s just as important to identify what caused the error in the first place and take action to ensure it doesn’t happen again.

No one should hold a negative attitude to making a sincere apology. Empty words are easy to say, but they are as useless as they sound. A real show of remorse demands hard work and commitment to put error right.

46. What does the author intend to tell us in the case of HP?

A. A true apology needs sincere actions.

B. HP should recall all the faulty computers.

C. Good quality makes a good company.

D. A company should apologize and pay for their mistakes.

47. According to the author, when we do anything wrong we firstly __________ .

A. make an apology face to face honestly

B. admit we were wrong and try to make the wrong right

C. take the responsibility for apologizing to others

D. choose the easiest thing to do

48. We can infer from the case of Thierry Henry that ______________ .

A. It’s never too late to say “I’m sorry.”

B. Writing an apology is not a good idea.

C. Henry didn’t identify his fault.

D. The football fans were mad with Henry.

49. Which of the following can best explain the word “commitment” in the last paragraph?

A. decision B. promise C. agreement D. responsibility

50. What’s the best title of this passage?

A. What really puts things right

B. Don’t apologize easily

C. Making an apology—no one is out of exception

D. How to judge an apology—sincere enough?

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