如图所示,建筑工人用一个滑轮组将重为600N的物体匀速提升2m所用的时间为40s

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问题:

如图所示,建筑工人用一个滑轮组将重为600N的物体匀速提升2m所用的时间为40s,人所用的拉力是400N,则

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A.此滑轮组的机械效率为75%

B.物体上升的过程中机械能总量不变

C.拉力所做的总功为2800J

D.此人的功率为40W

考点:滑轮(组)的机械效率功率的计算
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省局郭局长指出,贯彻落实省党代会关于“突出抓好非公企业和社会组织等领域的党建工作”的安排部署,必须处理好“四个关系”,请问是什么关系?

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In one way, it may be thought that failure(失败)is a part of life. In another, failure may be regarded as a step towards success.

The "spider-story" is often told as an example of this. Robert Bruce, leader of the Scots in the 13th century, was hiding in a hole on a hill from the English. He watched a spider(蜘蛛) making a web. Bruce is said to have got confidence from this and to have gone on to beat the English. Edison, too, the inventor of the light bulb(电灯泡) , made hundreds of models that failed before he found the right way to make one.

So what? First, always think about your failure. What caused it? Were you in high spir¬it then? What can you change so that things will go right the next time?

Second, is the goal(目标) you are trying to reach the right one? Try to do some thinking about what your real goals may be. Think about this question: "If I am successful in this, where will it get me?" This may help to prevent failure in the things you shouldn't be doing anyway.

The third thing to remember about failure is that it's a part of life. Learn to "live with yourself” even though you may have failed. Remember, "You can't win them all. “

小题1:Robert Bruce was mentioned in the passage to show that        .

A.people who fail are not lonely

B.animals can help people sometimes

C.nature will help us if we are hard-working

D.confidence is important for one to be successful小题2:Edison's example shows us that        .

A.he liked to do other kinds of work

B.he invented many kinds of light bulbs

C.failure may be a way towards success

D.he was a man of many important inventions小题3:If you are not sure about what success will get you, you'd better         .

A.change your goal

B.go on with your goal

C.not care for that

D.work even harder on your goal小题4:It can be learned from the passage that        .

A.one should try not to fail

B. one's failure is another's success

C.one should take failures seriously

D.one should learn lessons from failures小题5:This passage is mainly about        .

A.two great men

B. two sides of failure

C.ways to keep away from failure

D. the right attitude(态度) towards failure

题型:多选题

凝血酶原时间延长可见于下述疾病,但哪项除外?()

A.严重肝病

B.维生素K缺乏症

C.纤维蛋白原缺乏

D.阻塞性黄疸

E.血友病

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内服能清肺化痰,外用能清热解毒的药物是

A.蛇床子

B.硼砂

C.炉甘石

D.明矾

E.蜂房

题型:多选题

要在年轻人的脸上画出年龄结构感,不是在脸上随便画几条结构线就可以了,一定要用到()。

A.面

B.点

C.线

D.线面结合的方法

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