热力膨胀阀的调节作用是( )。 A．用流量的变化调节蒸发温度 B．用流量的变化调节

发生输血反应如何处理？（）

A.停止输血，对症处理

B.余血送回输血科复查血型、交叉配血、做血培养

C.请临床详细填写输血反应反馈信息卡交输血科

D.直接由临床送检验科处理

E.不停止输血，对症处理后，减慢输血速度，观察病情变化

韩国在移动商务的发展中，注重标准化工作。标准充电器就是韩国的三大电信公司提出的。

巨细胞病毒感染主要的传播途径是（）

A.性交传染

B.接吻

C.输血

D.饮食

E.衣物

Daniel Blair recently joined an investment club with several of his coworkers. Members of the club are generally quite conservative and are unwilling to invest in debt securities with credit ratings below AA. New investments are always evaluated in the context of the overall portfolio. Based on the attributes of the investment club members, they will most likely pursue an investment strategy that:（）

A. attempts to reduce a portfolio’s standard deviation through diversification. 

B. seeks the lowest risk securities. 

C. tries to totally eliminate systematic risk.

中国解决一切问题的关键是什么？