当水样中总碱度浓度较低时，应如何操作以提高测定的精度？
参考答案：
改用0.01mol/L盐酸标准溶液滴定，或改用微量滴定管，都可提高测定精度。
剩余法中估算开发商的合理利润的计算基数一般为（）。
A.不动产的总价
B.预付总资本
C.建筑费专业费
D.房地产售价
E.不动产的总价和建筑费
--As for Mr Brown, do you know ?
--Sure. Canada. But he has been teaching French for two years in Shanghai.
A. where he is working B. where he comes from C. where is his motherland
