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【单选题】
液化石油气的爆炸极限为2～10%，使具有爆炸危险的范围扩大，增加了（）。A.
储存的安全性
B.
运输可靠性
C.
储存安定性
D.
燃烧爆炸的危险性
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举一反三
【简答题】The passage mentions ______ obstacles that stand in the way of energy conservation.
【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】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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