小明用弹簧测力计水平拉着重10N的木块在水平木板上做匀速直线运动,此时弹簧测力计

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问题:

小明用弹簧测力计水平拉着重10N的木块在水平木板上做匀速直线运动,此时弹簧测力计的示数如图所示,若小明拉着木块匀速向右移动了0.5m,则拉力做的功是______J,重力对木块做的功是______J.

考点:功的计算
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How often do you use your car? Can you use your car less often? Do you know the following facts in the UK?

• About 50% of all car journeys are just for fun.

• Over 80% people go to work by car.

• 25% car journeys are under two miles.

• 70% car journeys are under five miles.

WALKING & CYCLING

Instead of using the car for short journeys, why not walk or ride a bicycle? Walking is a most popular form of exercise—it’s healthy and it can save you money. If you work nearby, try walking or cycling instead of driving.

BUSES

Bus companies are using new buses: some run on new fuels which produce less pollution; some have easier access for disabled and old people. There are special traffic lanes (行车道) to make bus journeys easier and more reliable. So do something to help solve the pollution problem—let the bus take you to work and your children to school.

TRAINS

All car journeys, long or short, can be hard work. For some trips it is wiser to take the train. Leave your car at home and walk, cycle or take a bus to and from the station. Train travel is fast, safe and comfortable. Train tickets are not always expensive; some are quite cheap at discount.

小题1:How many of car journeys are just for fun in the UK?  

A.25%.

B.About 50%

C.70%。

D.Over 80%.小题2:The writer believes that ________ can give children valuable road experience.

A.walking to school

B.travelling by train

C.taking new fuel buses

D.having car journeys for fun小题3:What is the main purpose of this passage?

A.To teach people how to use the buses.

B.To encourage people to travel by train.

C.To advise people to use cars less often.

D.To tell people to obey traffic rules.

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高频保护运行中两侧必须同时投入或退出运行。()

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接收并阅读由yufish@126.com发来的E-mail,并将随信发来的附件以文件名xiang.txt保存到考生文件夹下。

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炉膛压力低跳炉动作值是多少?

题型:填空题

鱼苗车辆能否通过驼峰,在()中有具体规定。

A.《铁路技术管理规程》

B.《行车组织规则》

C.《车站行车工作细则》

D.《作业标准》

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