试题与答案

压缩式电冰箱是利用制冷剂在制冷系统中发生周期性的物态变化,通过制冷剂的汽化吸热来

题型:问答题

题目:

压缩式电冰箱是利用制冷剂在制冷系统中发生周期性的物态变化,通过制冷剂的汽化吸热来达到降温的目的.电冰箱内一般构造如图所示.冰箱的最上层为速冻室(冷源),下层为冷藏室,它分为上、中、下三格.现有一批食物:鲜鱼、肉、水果、蔬菜.你怎样最科学地把这批食物放在冷藏室的上、中、下的格子中储藏?为什么这样放置保鲜效果最佳?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B, C

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2. I often play with Julie. She is my __________(亲密的) friend.

3. At the __________(开始), we didn't enjoy the party at all.

4. __________(幸运), he didn't hurt himself in the fire.

5. Do you know who is the __________(总统) of the USA?

6. Liu Xiang and Yao Ming are both my __________(英雄).

7. My favourite s__________ is Home Economics.

8. His daughter has poor e__________. She can't see the words on the blackboard.

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10. It is a m__________ school. Boys and girls have lessons together.

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