纳洛酮()
A.钙通道阻滞剂
B.氧自由基清除剂
C.吗啡类拮抗剂
D.抗凝剂
E.直接血管扩张剂
参考答案:C
三分群白细胞直方图上,中间细胞区不包括哪类细胞
A.单核细胞B.嗜酸性粒细胞C.嗜碱性粒细胞D.中性粒细胞E.幼稚细胞
A portfolio of options had a return of 22 percent with a standard deviation of 20 percent. If the risk - free rate is 7.5 percent, what is the Sharpe ratio for the portfolio()
A. 0.725.
B. 0.147.
C. 0.267.