心室肌的有效不应期较长，一直持续到( )。
A．收缩期开始
B．收缩期中间
C．舒张期开始
D．舒张中后期
E．舒张期结束
参考答案：C
Use the following data to analyze a stock's price earnings ratio (P/E ratio): The stock's beta is 1.2. The dividend payout ratio is 60%. The stock's expected growth rate is 7%. The risk free rate is 6% and the expected rate of return on the market is 13%. Using the dividend discount model, the expected P/E ratio of the stock is closest to:
A. 8.1. B. 10.0. C. 12.0.
世界上第一部药典是（）
A.《本草纲目》
B.《新修本草》
C.《黄帝内经》
D.《伤寒杂病论》
E.《神农本草经》
