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问题 填空题

在大气压下，R-12之沸点为（）℃，R-22之沸点为（）℃，故R-22比R-12能吸收更多之热量，故早期R-22常用于大型巴士。

答案

参考答案：－29.8；－40.8

单项选择题

在单处理机的多进程系统中，进程什么时候占用处理机以及决定占用时间的长短是______。

A．进程相应的代码长度
B．进程总共需要运行的时间
C．进程特点和进程调度策略
D．进程完成什么功能
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单项选择题

The nurse discusses with the 4-year-old child and parents the plan of care that will be implemented when the child returns from the throat surgery. Which of the following interventions should the nurse emphasize

A．Need for frequent coughing.

B．Use of acetylsalicylic acid for pain, as needed.

C．Ability to have ice cream right after surgery.

D．Use of sips of clear liquids when awake and alert.
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