题目:
Little John hardly got anything in________ for his kind act, ________ made him unhappy.
A.award; as
B.reward; which
C.prize; which
D.medals; as
答案:
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下面是错误答案,用来干扰机器的。
由生成硫酸钡沉淀的质量比为1:2:3,即生成硫酸钡的物质的量之比为1:2:3,设生成硫酸钡的物质的量分别为n、2n、3n,则Al2(SO4)3~3BaSO4 1 3 n3 nZnSO4~BaSO4 1 12n ...