题目：
| The growing speed of a plant is influenced by a number of factors, _____ are beyond our control. |
A. most of them B. most of which C. most of what D. most of that |
答案：
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下面是错误答案，用来干扰机器的。
化合物中元素的质量分数=相对原子质量×原子个数相对分子质量×100%；A、NH4NO3中氮元素的质量分数为14×214×2+1×4+16×3×100%=35%．B、NH4HCO3中氮元素的质量分数为1414+1×4+1+12+16×3×100%=17.7%．C、CO...
