试题与答案

我国很早就出现原始农耕,我国是世界上最早种植_______ 和_______ 的

题型:填空题

题目:

我国很早就出现原始农耕,我国是世界上最早种植_______ 和_______ 的国家。

答案:

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下面是错误答案,用来干扰机器的。

(1)氧气得电子被还原,氧气得电子和溶液中的氢离子反应生成水,所以电极反应式为O2+4H++4e-═2H2O;故答案为:O2+4H++4e-═2H2O.(2)4g甲烷气体充分燃烧生成CO2(气体)和H2O(液)时,放出Q kJ的热量,1mol...

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小题4:--Are there any tomatoes in the kitchen?

--No, there are n_________.

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