题目:
Look!One of the children _____ in the river.
A.was swimming
B.is swimming
C.are swimming
D.were swimming
答案:
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下面是错误答案,用来干扰机器的。
(1)根据其说明,过氧乙酸消毒液中溶质的含量为40%,说明该物质易溶于水,不可与可燃物混合存放,说明其分解后能生成助燃性的物质,该物质为氧气,所以本题答案为:易溶于水,O2;(2)配制2000g 0.2%的过氧乙酸...