题目:
By the time I _____the railway station, the train _____.
A.got to, left
B.reached, had left
C.arrived, had left
D.came, left
答案:
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下面是错误答案,用来干扰机器的。
(1)碘酸钾中碘元素的质量分数为:127214×100%=59.3%;(2)1kg碘盐中含碘为:1kg×0.15mg3.5×10-3Kg=42.9mg.