问题 名词解释

简述机械振动式调压器的工作原理。

答案

参考答案:

发动机工作时,调节器膜片右方承受弹簧压力和进气管内气体压力之和,膜片左方承受燃油压力,当压力相等时,膜片处于平衡位置不动。当进气管内气体压力下降时,膜片向右移动,回油阀开度增大,回油量增多,使输油管内燃油压力下降;反之,进气管内气体压力升高时,燃油的压力也升高。

完形填空

从A、B、C、D、E、F六个选项中选择正确的选项作为文章第3-7段小标题,并将序号填入五个空格中,其中一项多余。

Do you have any special ways you use to help you do better on a test? How well you do is often a matter of how well prepared you are. Here are some ways to make sure you’re at your best on test days.

Go to bed early. The night before a test is not the time to stay up watching TV. You have tio be awake for the test day.

小题1:Test day isn’t a morning for pieces of bread. Nor is it a time to hunger yourself. Eat plenty of low-sugar, high-enegy food to keep your brain and body working their best.

小题2:Make sure you have two pencils and anything else you were asked to bring.

小题3:Make sure that the number on your answer sheet matches the number of the question.

小题4:Don’t suppose that choice A is correct until you’ve checked the others. You may find a better one. And it is wrong to eliminate* any choice that you can see at once. You’ll have a better chance of finding the right answer.

小题5:Make sure you allow yourself enough time to answer every question and go back and check your answers. Don’t spend too much time on any difficult question. Pass it and come back to it later.

Keep up with your schoolwork all year long. That’s how you get the skills you need for taking tests.

A.Watch the numbers

B.Check the clock

C.Be prepared

D.Look over all the answer choicesE、Have a good breakfast        

F、Answer quickly and don’t care about difficult question

填空题