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下列反应过程中的能量变化与如图一致的是(   )

A:2Al+Fe2O3 高温__ 2Fe+Al2O3

B:CaCO3 高温__ CaO+CO2↑

C:C+H2O 高温__ CO+H2

D:C+CO2 △__ 2CO

上一题 下一题 0.0难度 选择题 更新时间:2018-05-07 12:39:05

答案(点此获取答案解析)

A

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若m、n满足=0,则

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下列省区之间以黄河干流为天然界线的是

同类题3

还剩____只。

 ____  ____  ____ = ____ (只)

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在横线上分别填入三个质数,使等式成立。

____+____+____=50

同类题5

    A group of frogs were traveling1 the forests, but suddenly two of them fell into a hole. The other frogs tried to help them. When they saw how deep the hole was, they cried to the two frogs that they could not be saved. The two frogs didn't2 and tried their best to jump up out of the hole. The other frogs 3saying that they were sure to die. 4, one of the two frogs, who heard what the other frogs were saying, gave up. Then he fell down and died.
    The 5 frog, however, continued to jump as 6as he could, and at last made it out. When he 7 , the other frogs asked, "Didn't you hear us?" The frog, who had a poor 8, said, "I thought you were encouraging me all the time."
    The story teaches us a 9:There is power(力量) of life and death in the tongue. An encouraging 10 to those who are down can help them out while a discouraging word can kill them.

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