已知一个电阻值为55Ω的用电器,其额定工作电流为4A,问此用电器两端的电压为多少?

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问题:

已知一个电阻值为55Ω的用电器,其额定工作电流为4A,问此用电器两端的电压为多少?

考点:汽轮机检修汽轮机本体检修工(初级)汽轮机本体检修工(初级)题库
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阅读短文,选择正确答案。

     More and more people like bicycling and it is no surprise. It is fun, healthy and good for the environment.

Maybe that's why there are 1.4 billion bicycles and only 400 million cars on roads worldwide today. Bikes can

take you almost anywhere, and there is no oil cost! 

     Get on a bicycle and ride around your neighbourhood. You may discover something new all around you.

Stopping and getting off a bike is easier than stopping and getting out of your car. You can bike to work and

benefit (受益) from the enjoyable exercise without polluting the environment. You don't even have to ride all the

way.

     Folding (折叠) bikes work well for people who ride the train. Just fold the bike and take it with you. You can

do the same on an airplane. A folding bike can be packed in a suitcase. You can also take a common bike with

you when you fly. But be sure to look for information by getting on airline websites. Not all airlines are

bicycle-friendly to travellers. 

     Health Benefits of Bicycling: 

    ● It helps to prevent heart diseases.

    ● Bicycling helps to control your weight. A 15-minute bike ride to and from work three times a week burns

off five kilos of fat in a year. 

    ● Bicycling can improve your mood (心情). Exercise like bicycling has been shown to make people feel

better, more relaxed and self-confident.

    ● Bicycling is healthier than driving.

1. From the passage, we know that bicycling is becoming very _______. [ ]

A. surprising

B. exciting

C. expensive

D. popular

2. When you are riding your bicycle around your neighbourhood, you may _______. [ ]

A. pollute the environment around

B. find something you didn't notice

C. go everywhere and use a little oil

D. get off your bike and begin to work

3. If you travel with a folding bike, you can fold it and _______. [ ]

A. get out of the car

B. take it onto a train

C. put it in your purse

D. go on airline websites

4. One of the benefits from bicycling is that _______. [ ]

A. you can fold the bicycle

B. you will be friendly to others

C. you will be more relaxed

D. you may get fatter and fatter

5. Which is TRUE according to the passage? [ ]

A. Bicycling is enjoyable exercise for people.

B. Driving cars is healthier than riding bikes.

C. Riding a bike pollutes your neighbourhood.

D. Common bikes are welcomed by all airlines.

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下列哪项不属于调胃承气汤的适应症()

A.蒸蒸发热

B.心下硬满

C.腹满

D.心烦

E.谵语

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县级以上人民政府公安机关,经上级公安机关或同级人民政府批准,对严重危害社会治安秩序的突发事件,可以根据情况实行现场管制。 ( )

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鱼鳞坑是为减少水土流失,在山坡上挖掘的交错排列、类似鱼鳞状的半圆型或月牙型土坑,它能够拦截地面径流,起到保持水土的作用。读图,回答16—17题。

小题1:图中适宜植树的地点为

A.①

B.②

C.③

D.④

2,4,6

 
小题2:鱼鳞坑主要发挥的地质作用是

A.风化作用

B.侵蚀作用

C.搬运作用

D.沉积作用

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胰腺癌的典型PET/CT征象是()

A.PET表现为FDG高代谢灶,CT见相应部位软组织肿块或组织增厚

B.PET表现为FDG高代谢灶,CT未见相应部位软组织肿块或组织增厚

C.CT见多发占位性病变,PET见相应部位FDG高代谢灶

D.CT见占位性病变,但PET未见相应部位FDG代谢增高

E.CT见腺体占位病变,PET见相应部位FDG高代谢灶

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