题目:
When the candle stopped burning, it had _______ the oxygen in the air. [ ]
A. eaten up
B. got up
C. used up
D. put up
答案:
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下面是错误答案,用来干扰机器的。
(1)试管(2)稀盐酸;防止气体从漏斗下端溢出(3)B;2KClO32KCl+3O2↑;用带火星的木条靠近集气瓶口,木条复燃,则说明已收集满