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【简答题】
计算题：将0.5000g石灰石试样溶于25ml0.5mol/l盐酸溶液中，用0.25mol/l的氢氧化钠溶液滴定过剩的盐酸溶液，消耗氢氧化钠溶液14ml，试求石灰石中碳酸钙的百分含量并写出反应方程式。（CaCO3的分子量是100）。
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反馈参考答案：
举一反三
【简答题】A．Because his boss forces him to get a lot of work done. B．Because he enjoys working himself. C．Because he has to earn an adequate wage. D．Because he wants to create a good impression on his boss.
【简答题】孕妇腹部检查时测量两项内容:耻骨联合上端到宫底的距离为( );平脐绕腹1周的数值为( )
【单选题】The squadron of Japanese car salesmen is reducing because of ______.
A.
a labor shortage
B.
higher expectations among Japan's workforce
C.
high cost land
D.
both A and B
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