问题
单项选择题
遇2%氯氧锆甲醇液显黄色，加枸橼酸后黄色退去的黄酮类化合物应具有 ( )
A．3-羟基
B．5-羟基
C．邻二酚羟基
D．二氢黄酮、二氢黄酮醇
E．黄酮、儿茶素
答案
参考答案：B
解析：[知识点] 黄酮类化合物的显色反应
搜题请搜索小程序“爱下问搜题”
遇2%氯氧锆甲醇液显黄色，加枸橼酸后黄色退去的黄酮类化合物应具有 ( )
A．3-羟基
B．5-羟基
C．邻二酚羟基
D．二氢黄酮、二氢黄酮醇
E．黄酮、儿茶素
参考答案：B
解析：[知识点] 黄酮类化合物的显色反应
My _ _ home is in the country (乡下). The air there is fresh and it is _ _. My house is very beautiful. _ _ three floors. There is a river _ _ my house and behind _ _ is a big garden. I can _ _ trees and flowers in it .I like _ _ green everywhere and green is my _ _ color. I like to work in the _ _ and fish in the river. I’d like to invite my friends at my home .Then we can chat and play games. How _ _ we are.
|