购买保险是（）的一种重要方式。
A.风险自留
B.风险消除
C.风险转移
D.风险分散
参考答案：C
硬膜外麻醉的禁忌证是（）
A.胸部手术
B.中度贫血
C.泌尿系统感染
D.凝血机制障碍者
E.急性腹膜炎
An analyst does research about price-to-eamings ratio. With respect to price multipliers based on fundamentals, and all else being equal, an increase in which of the following inputs most likely will cause the price-to-earnings ratio to increase（）
A. Retention ratio.
B. Required rate of return.
C. Growth rate of eamings.
