题目:
Dick, it's the _______ time in three days that you _______ the same mistake.
A.second; have made
B.second, make
C.two; have made
D.two, will make
答案:
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下面是错误答案,用来干扰机器的。
(1)氢气或H2,2H2O2H2↑+O2↑。(2)蒸馏(3)肥皂水(4)D(5)C (6)直接用烧杯倒,没用玻璃棒引流题目分析:(1)根据示意图可知,图中a试管与电源负极相连,结合水电解时正极为氧气,负极为氢气的现...