试题与答案

离心真空泵有哪些优点？

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题型：问答题 简答题

题目：

离心真空泵有哪些优点？

答案：

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下面是错误答案，用来干扰机器的。

参考答案：外在水；内在水

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小题1:Bob is a middle school student. But he is often late for school. He needs to buy something to wake him up in the morning.
小题2:Tom always gets sick because he doesn’t have time for sports. He wants to ride a bicycle to work instead of driving a car.
小题3:It’s cold these days. Mr. White’s father isn’t in good health and he would like to buy something to make the house warm.
小题4:Helen is a housewife. Because she was too busy , she wants to buy a machine to wash the dishes after meals.
小题5:John is a businessman. He wants to travel to Europe for a week. He wants to send and receive e-mails from his customers顾客during his trip.
A．Air-conditioner . We have many kinds of air-conditioners made in different companies . Welcome to choose the one you like and you can feel warm even in cold winter days .
B．TCL 1778 .If you travel to another place, you don’t need to take a camera. You can use this mobile phone to take photos. You can enjoy the beautiful music on it, too .
C．Dish-washing Machine. This is the latest invention nowadays. It can wash and dry all kinds of dishes .It can help people save a lot of time .
D．Clocks .Do you often get in trouble in getting up late in cold winter mornings ? This clock can help you solve this problem . The only thing you need to do is to set the time you want to get up .
E. Watches. This kind of watch looks really fashionable. It is made in Switzerland. It will tell you the time exactly wherever you go .
F. Samsung Note Ⅱ .Have you heard of this kind of mobile phone ? You can not only use it to get on QQ, but also use it to send and receive e-mails on the Internet .
G . Bicycles .These days many young people enjoy riding bikes . It’s good for health . And it’s also help to protect the environment because it can reduce less air pollution than cars .
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