问题 多项选择题

RFID标签具有各种各样的形状,但不是任意形状都能满足阅读距离及工作频率的要求,必需根据系统的工作原理,即()(变压器原理)还是(雷达原理),设计合适的天线外形及尺寸。

A、电感耦合

B、空间耦合

C、电磁耦合

D、时间耦合

答案

参考答案:A, B

阅读理解

阅读理解

     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 l. 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 neighborhood. 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 take 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 going to and returning from

work three times a week bums off rive kilos of fat in a year.

     ●Bicycling can improve your mood(必情) .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 neighborhood,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 an enjoyable exercise for people.

B. Driving cars is healthier than riding bikes.

C. Riding a bike pollutes your neighborhood.

D. Common bikes are welcomed by all airlines.

问答题 简答题