为了避免咖啡机锅炉及管道里产生水垢,应安装()。
A、热水器
B、软水器
C、净水器
D、消毒器
参考答案:B
压力控制通气和压力支持通气的基本不同点是()。
A.压力时间波形图的外观
B.吸气如何结束
C.限制患者吸气压力高值的能力
D.初始呼吸机的流速
E.吸气如何开始
As the prisoner had been ______from the outside world for twenty years, he had no idea what the
outside world was like. [ ]
A. cut off
B. cut away
C. cut out
D. cut short