主风机单向阻尼阀的作用是什么？
参考答案：主风机出口单向阀的作用是防止主风倒流，防止再生器僋到流入主风机内从而避免毁机，伤人的严重事故。
随着我国市场经济的发展，居民投资方式日益多样化。如果你将10000元人民币，存入银行，存期为三年，年利率为4%，存款到期应得本息为
A．1200
B．1140
C．11200
D．12000
Following a precipitous delivery, examination of the client's vagina reveals a fourth-degree laceration. Which of the following would be contraindicated when caring for this client
A．Applying cold to limit edema during the first 12 to 24 hours.
B．Instructing the client on the use of sitz-baths if ordered.
C．Instructing the client about the importance of perineal (Kegel) exercises.
D．Instructing the client to use two or more peripads to cushion the area.
