题目:
_______over everything whenever we want to make a decision, many people believe, and we will have less chance of making mistakes.
A.Think
B.Thinking
C.To think
D.Thought
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:Fe2O3和Al2O3与硫酸反应生成Fe2(SO4)3和Al2(SO4)3,Fe2(SO4)3和Al2(SO4)3与NaOH反应生成Fe(OH)3、Al(OH)3沉淀和Na2SO4,根据S元素守恒可知H2SO4~Na2SO4,根据Na元素守恒可知2NaOH~Na2SO4,所以H...