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单选题
There are two disadvantages to CO2 pump as a firefighting agent. One of these is the limited quantity available，and the other is（）.
A
the lack of cooling effect on heated materials
B
that it cannot be used in a dead ship situation with no electrical power to the CO2 pump
C
that it breaks down under extreme heat to form poisonous gases
D
there is no effect on a class A fire even in an enclosed space
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更多 “单选题There are two disadvantages to CO2 pump as a firefighting agent. One of these is the limited quantity available，and the other is（）.A the lack of cooling effect on heated materialsB that it cannot be used in a dead ship situation with no electrical power to the CO2 pumpC that it breaks down under extreme heat to form poisonous gasesD there is no effect on a class A fire even in an enclosed space” 相关考题
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"With the price of gasoline and with the problems with clean air,it's important we get electric vehicles out on the road."
On California roads there are about two thousand electric cars．By 2003,ten percent of all new cars may be required to have zero emissions．This is a mandate automakers say it is way ahead of its time.
Gloria Bergquist of the Alliance of Auto Manufacturers says,"The technology(for zero emissions)isn't here yet;it still needs advancement in driving range to make it more appealing to a wider consumer audience."
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Tim Carmichael of the Clean Air Coalition says,"The automakers have not built a vehicle unless required to do so,so it's very important for the state to stay committed to this program requiting automakers to build small amounts in beginning years and then the market will take off."
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B.Two months ag
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考题
已知Ag2CO3（s）在298.2K时的分解反应
Ag2CO3（s）＝Ag2O（s）＋CO2（g）
的ΔrGmθ=12.89kJ.mol-1求
若大气中含0.1%的CO2（体积），298.2K时Ag2CO3在大气中能否自动分解？
考题
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