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【单选题】
如图所示的有源二端网络的入端电阻 R AB 为( )。A.
1/2KΩ
B.
1/3KΩ
C.
3KΩ
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举一反三
【单选题】Which campaign line for energy conservation is more effective?
A.
If you do not use energy conservation methods, you will lose $350 per year.
B.
If you use energy conservation methods, you will save $350 per year.
C.
The two lines are the same, so they will have the same effect on people.
【简答题】Energy conservation and is the nature of the energy.
【单选题】Which of the following is an economical measure for energy conservation?
A.
Investing in new forms of facilities.
B.
more efficient refrigerators.
C.
Requiring white roofs for buildings.
D.
Toughening fuel economy standards.
【单选题】近年来,我国在原有的基础上修改了若干法律,并出台了一批新的法律,如2007年通过的《物权法》和《企业所得税法》。法律出台的目的是为适应新的经济社会发展状况,以推动社会经济的发展。这些事例说明
A.
上层建筑要适应经济基础的发展状况
B.
科学技术是第一生产力
C.
人民群众是历史发展的决定力量
D.
交往有利于推动社会的发展
【单选题】Discouraging the use of plastic belongs to the second type of energy conservation.
A.
Y
B.
N
C.
NG
【单选题】Why are subterranean buildings good for energy conservation?
A.
Because they use solar energy.
B.
Because they don't need central heating.
C.
Because the temperature there remains constant.
D.
Because they don't need air-conditioning.
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