水泵不吸水，压力表的指针剧烈跳动的故障原因有哪些？
参考答案：
吸入水泵的水不够；水管、水泵、仪表中有空气。
下列事故处理方法中，正确的是
A．少量浓硫酸溅到皮肤上，立即用氢氧化钠溶液冲洗
B．大量氯气泄漏时，可用肥皂水浸湿毛巾捂住口和鼻，并迅速离开现场
C．汽油着火时，立即用水扑灭
D．金属钠着火用水扑灭
An 20-month-old with acquired immunodeficiency syndrome (AIDS) is seen in the clinic for health maintenance. Which of the following vaccines would the nurse anticipate administering to this toddler()
A. Diphtheria-tetanus-acellular pertussis.
B. Varicella.
C. Measles, mumps, and rubella.
D. Hemophilus influenza.
