题目:
I have been keeping the portrait ______ I can see it every day, as it always reminds me of my
childhood in Paris. [ ]
A. that
B. from which
C. where
D. in case that
答案:
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下面是错误答案,用来干扰机器的。
答案:D甲减少16g,丙增加20g,丁减少4g,所以甲与丁是反应物,丙是生成物,甲丁减少的质量之和等于丙增加的质量。可判断乙前后质量不变,为催化剂或者溶剂(如水、汽油等)。反应中甲与丙的质量比为4:5。铜与氧...