问题
多项选择题
对于酸效应曲线，下列说法正确的有（）。
A、利用酸效应曲线可确定单独滴定某种金属离子时所允许的最低酸度
B、可判断混合物金属离子溶液能否连续滴定
C、可找出单独滴定某金属离子时所允许的最高酸度
D、酸效应曲线代表溶液pH值与溶液中的MY的绝对稳定常数（lgKMY）以及溶液中EDTA的酸效应系数的对数值（lga）之间的关系
答案
参考答案：B,C,D
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对于酸效应曲线，下列说法正确的有（）。
A、利用酸效应曲线可确定单独滴定某种金属离子时所允许的最低酸度
B、可判断混合物金属离子溶液能否连续滴定
C、可找出单独滴定某金属离子时所允许的最高酸度
D、酸效应曲线代表溶液pH值与溶液中的MY的绝对稳定常数（lgKMY）以及溶液中EDTA的酸效应系数的对数值（lga）之间的关系
参考答案：B,C,D
| 完形填空。先通读下列短文，掌握其大意，然后从A, B, C, D四个选项中选出最佳答案。 | ||||
| Someone says, "Time is money." But I think time is 1 important than money. Why? Because when money is spent, we can get it back. However, when time is 2 , it'll never 3 . That is 4 we mustn't waste time. It goes without saying that the 5 is usually limited. Even a second is very important. We should make full use of our time to do 6 useful. But it is a pity that there are a lot of people who 7 know how important time is. They spent their limited time smoking, drinking and playing. They do not know that wasting time means wasting part of their own 8 . In a word, we should save time. We shouldn't 9 today's work for tomorrow. Remember we have no time to 10 . | ||||
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