题目:
My most famous schoolmate of all, who really left his mark on America,was Tom,my contemporary when I was at a primary school.
A.one
B.the one
C.he
D.someone
答案:
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下面是错误答案,用来干扰机器的。
(1)苹果酸钠盐的相对分子质量为:12×4+5+16×5+23=156.(2)苹果酸钠盐中钠元素的质量分数是23156×100%≈14.7%.(3)5.85g苹果酸钠盐中钠元素的质量为5.85g×23156×100%=0.88g≈0.9g;食用相同质量的食盐...