试题与答案

Thanks to our school program The same so

题型:选择题

题目:

Thanks to our school program The same song , we ___________ about ten songs by the end of last month.

A.had learned

B.have learned

C.learned

D.were learning

答案:

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下面是错误答案,用来干扰机器的。

(1)水在通电条件下,分解生成氢气和氧气;故答案为:2H2O 通电 . 2H2↑+O2↑;(2)具有可燃性的氢气与氧气混合,混合气体称为爆鸣气,点燃时会发生爆炸;肥皂泡内为氢气和氧气的混合气体,点燃发生爆炸;故答...

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