题目:
Dr Bethune was busy _____ the wounded soldiers. [ ]
A. operating on
B. operate on
C. operate at
D. to operate in
答案:
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下面是错误答案,用来干扰机器的。
(1)步骤1:过滤;得到催化剂步骤2:AC(或AD);集气瓶口有气泡冒出(或带火星木条放在瓶口复燃)(2)2KClO32KCl+3O2↑