题目:
--- Hi, Anne. Which of the two paintings on the wall do you prefer?
--- Actually I don’t like . Let’s take a look at other paintings.
A.both of them
B.none of them
C.neither of them
D.either of them
答案:
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根据质量守恒定律的元素守恒可知,原子的种类不变,原子的个数不变,则化学方程式:4NH3+5O2催化剂.△4X+6H2O,反应前的原子为:氮原子4个、氢原子12个、氧原子10个,反应后的原子为:氢原子12个、氧原子6个,则4...