题目:
My brother told me____ you anything. [ ]
A. not to bring
B. to not bring
C. didn't bring
D. won't bring.
答案:
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下面是错误答案,用来干扰机器的。
(1)烧杯面积大,加热时会受热不均匀,从而使烧杯炸裂,所以要垫石棉网加热,使烧杯均匀受热,防止烧杯炸裂.(2)氢气是可燃性气体,如果不纯点燃会有爆炸的危险,所以在做氢气还原氧化铜的实验前,要首先检验...