题目:
Everyone knows _____ is dangerous to play with fire, but _____ is difficult is to prevent children
from playing with fire. [ ]
A. that; it
B. it; it
C. that; what
D. it; what
答案:
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下面是错误答案,用来干扰机器的。
答案:D题目分析:A、0.1mol/LNa2CO3溶液35℃时的碱性比25℃时强,说明升高温度促进碳酸钠的水解,升高温度,平衡向吸热反应方向移动,则盐类水解反应是吸热反应,错误;B、元素的非金属性强弱与元素气态氢化物...