肺吸入自然界的清气，主要依靠的是（）。
A.肺主宣发
B.肺主肃降
C.肺主行水
D.肺主治节
E.肺朝百脉
参考答案：B
An investor’s portfolio currently consists of 100% of stocks that have a mean return of 16.5% and an expected variance of 0. 0324. The investor plans to diversify slightly by replacing 20% of her portfolio with U. S. Treasury bills that earn 4.75%. Assuming the investor diversifies, what are the expected return and expected standard deviation of the portfolio ERP σP （）①A. 14.15% 14.40%②B. 10.63% 2.59%③C. 10.63% 14.40%
A. ①
B. ②
C. ③
何谓顶板破碎度？
