什么是正温度系数热电材料、负温度系数热电材料？

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The Problem with Television

Now I can’t watch much television but a few years ago,                         1.       

I was used to watch it every night.I was often                                               2.       

a little tired after a day’s work and watch TV                                              3.       

demands very little effort.Unfortunate,there are                                            4.       

too many people among my family.Some wanted                                          5.       

to see the programme while others preferred                                                 6.       

another.I am happy with any programme but                                                7.       

the others spent a lot time arguing and there                                                 8.       

was no way of settling the matter except by                                                         9.       

selling the set.Now someone at home reads instead.                                       10.       

“国家情况不妙。我们什么都有：土地、石油和天然气、其他资源；智慧和才能也都不错。我们的生活却比发达国家差得多，越来越落在他们后面……”这是戈尔巴乔夫辞职时发表的电视演说词。造成这种状况的根本原因是  [ ]

A．社会主义理论的缺陷

B．苏联社会主义模式的弊端

C．美苏冷战

D．经济危机和政治危机的发生

坡子街著名的古迹除火宫殿外，还有哪一个？

公司治理和内部控制的关系是（）

A.二者完全一致

B.对立统一

C.相辅相成

D.二者完全无关

某房间t=20±0.5℃，空调温度基数为0.5℃。