缩合鞣质经酸处理后生成（）
A.鞣红
B.没食子酸
C.逆没食子酸
D.儿茶素
E.表儿茶素
参考答案：A
What is the expected rate of return on a stock that has a beta of 1.4 if the market risk premium is 9 percent and the risk-free rate is 4 percent（）
A. 16.6%
B. 11.0%
C. 13.0%
“大力加强农田水利，保障国家粮食安全”是第几届“中国水周”的宣传主题？
