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简述姜黄素分光光度法测定水中硼的原理。

答案

参考答案：

在酸性条件下，水样中的硼与姜黄素共同蒸发，生成玫瑰花青苷的络合物，该络合物可溶于乙醇或丙烯醇中，在540nm处有最大吸收峰，其颜色深度与硼的含量成正比。

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        配对阅读.左栏是对5个人所需要的书的描述,右栏是8本书的书名,请你为每个人推荐最合适的一本书.
( )1.Nancy wants to learn more about computers. Because people     write to, and even talk to each other on the computer today.
(     )2.Mary is a good mother. She believes eating the right food is
important. She likes to help her children grow better by eating the right
food.
(     )3.Kevin often sits at his desk, studying all night, but he still gets poor grades. He hopes to do better in the tests.
(     )4.Bob's sister wants him to move to New York. But he isn't sure if
that is a good idea. He needs to know more about the country.
(     )5.Army is worried that there are too many used bags. She doesn't
know how to do with(处理) them.		The following is the list of some books:
A. How to Be Good Learners.
B. Make the Waste Useful.
C. Around the World in Eighty Days.
D. You Are What You Eat.
E. Chicken Run.
F. How to Use the Internet.
G. 101 Q & A about America. H. Harvard Girl-Liu Yiting.
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填空题

九味羌活汤主治（），里有蕴热证，方中清泄里热的药物是（）
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