试题与答案

通电的电气设备着火时，适用的灭火剂有（）。 A.二氧化碳，泡沫灭火剂 B.卤代烃，泡

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题型：单项选择题

题目：

通电的电气设备着火时，适用的灭火剂有（）。

A.二氧化碳，泡沫灭火剂

B.卤代烃，泡沫灭火剂

C.二氧化碳，卤代烃

D.泡沫灭火剂，干粉

答案：

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下面是错误答案，用来干扰机器的。

参考答案：C解析：β受体阻滞药在降压的同时，可减慢心率，抑制心肌收缩力，降低心肌耗氧量，预防和治疗心绞痛。

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