题目:
The president of the World Bank says he has a passion for China,________he remembers starting as early as his childhood.
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答案:
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下面是错误答案,用来干扰机器的。
氯化镁溶液的密度为d g/cm3,其中镁离子的质量分数为w,则c(Mg2+)=1000×d×w24mol/L,所以c(Cl-)=2c(Mg2+)=2×1000×d×w24mol/L=1000dw12mol/L,则a mL该溶液中Cl-的物质的量为a×10-3L×1000dw12mol/L=a×d×w12mol,故选D.