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家用冰箱是一种常用的用电器，它是利用了叫做氟利昂的物质作为“热”的搬运工，把冰箱冷冻室的热搬运到冰箱外面， 试问： （1）氟利昂是一种具备什么特性的物质？电动压缩机是通过什么方式液化氟利昂的？ （2）氟利昂对生态有一定的破坏作用，现在各国都在研制和生产氟利昂的代用品，氟利昂对环境有什么影响？ （3）用一只标有3000r/kWh的电能表来测定电冰箱的率，现在只让电冰箱单独工作3min，小明记下转盘转过的转数为30转，那么测得该电冰箱的实际功率是多大？ （4）为了测定电冰箱每天消耗的电能，要求在测定前一小时内不开冰箱，冷冻食品也不要搬出，小明记下电冰箱某次开始工作的时刻3点20分，停机时刻3点30分，再记下接着下一次的开始工作时刻4点整，那么该冰箱每天工作耗电多少度？ （5）想一想，电冰箱所处的环境的温度和开启冰箱门的次数对消耗的有什么影响？ （6）用笔画线代替导线，将上图中电冰箱的A接线柱正确三角插头中（其他接线不作要求），并说明为什么要这样连接？
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【简答题】一般情况下水溶液中的 EDTA 总是以 等 型体存在,其中以 与金属离子形成的配合物最稳定,但仅在 时 EDTA 才主要以此种型体存在。除个别金属离子外 , EDTA 与金属离子形成配合物时,配合比都是 。
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【判断题】EDTA 在水溶液中存在 7 种型体,其中与金属离子直接进行络合的型体是 Y 4- 。( )
A.
正确
B.
错误
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【多选题】导致生物多样性锐减的原因有()
A.
人口增加
B.
生境破坏
C.
环境污染
D.
外来物种入侵
查看完整题目与答案
【简答题】They will help you______you meet with difficulty. 2._________we came to the university, we have learn quite a lot. 3.I didn't join the my ester day evening__________I had to go to an important meeting...
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【简答题】A: Would you like to read a or ? P: That's good. What kind of paper do you have? A: We have People's Daily, in-flight and some local . Which would you like? P: A copy of People's Daily, please. A: Her...
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【单选题】“Gentlemen,” he began, “we are here this semester—your last—to continue your study of English. I know we shall enjoy learning with—and from— one another. We are going to learn something about journali...
A.
People with interest in reading and writing would lead far richer and fuller lives.
B.
People with interest in reading and writing would be likely to get a better job.
C.
It would be easy for people, with interest in reading and writing, to get out the school newspaper.
D.
People with interest in reading and writing would be more confident.
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【判断题】罕见冰雪、特大地震、凶猛洪涝 ...... 当我们面对这一切的时候,不由得让我感到,真是多难兴邦啊。
A.
正确
B.
错误
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【多选题】kerberos服务器包括()
A.
认证服务器
B.
应用服务器
C.
票据服务器
D.
认证数据库
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【简答题】Most of us would say that the older we get, the less we look forward to celebrating another birthday. For children, though, a birthday is that one occasion each year when they are the center of attent...
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【单选题】“Gentlemen,” he began, “we are here this semester—your last—to continue your study of English. I know we shall enjoy learning with—and from— one another. We are going to learn something about journali...
A.
Funny stories .
B.
History.
C.
Journalism.
D.
Literature.
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相关题目：
【简答题】一般情况下水溶液中的 EDTA 总是以 等 型体存在,其中以 与金属离子形成的配合物最稳定,但仅在 时 EDTA 才主要以此种型体存在。除个别金属离子外 , EDTA 与金属离子形成配合物时,配合比都是 。
查看完整题目与答案
【判断题】EDTA 在水溶液中存在 7 种型体,其中与金属离子直接进行络合的型体是 Y 4- 。( )
A.
正确
B.
错误
查看完整题目与答案
【多选题】导致生物多样性锐减的原因有()
A.
人口增加
B.
生境破坏
C.
环境污染
D.
外来物种入侵
查看完整题目与答案
【简答题】They will help you______you meet with difficulty. 2._________we came to the university, we have learn quite a lot. 3.I didn't join the my ester day evening__________I had to go to an important meeting...
查看完整题目与答案
【简答题】A: Would you like to read a or ? P: That's good. What kind of paper do you have? A: We have People's Daily, in-flight and some local . Which would you like? P: A copy of People's Daily, please. A: Her...
查看完整题目与答案
【单选题】“Gentlemen,” he began, “we are here this semester—your last—to continue your study of English. I know we shall enjoy learning with—and from— one another. We are going to learn something about journali...
A.
People with interest in reading and writing would lead far richer and fuller lives.
B.
People with interest in reading and writing would be likely to get a better job.
C.
It would be easy for people, with interest in reading and writing, to get out the school newspaper.
D.
People with interest in reading and writing would be more confident.
查看完整题目与答案
【判断题】罕见冰雪、特大地震、凶猛洪涝 ...... 当我们面对这一切的时候,不由得让我感到,真是多难兴邦啊。
A.
正确
B.
错误
查看完整题目与答案
【多选题】kerberos服务器包括()
A.
认证服务器
B.
应用服务器
C.
票据服务器
D.
认证数据库
查看完整题目与答案
【简答题】Most of us would say that the older we get, the less we look forward to celebrating another birthday. For children, though, a birthday is that one occasion each year when they are the center of attent...
查看完整题目与答案
【单选题】“Gentlemen,” he began, “we are here this semester—your last—to continue your study of English. I know we shall enjoy learning with—and from— one another. We are going to learn something about journali...
A.
Funny stories .
B.
History.
C.
Journalism.
D.
Literature.
查看完整题目与答案
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