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问题 单项选择题

人群对人类免疫缺陷病毒易感性正确的描述是（）

A.人群对HIV普遍易感

B.已婚者易感

C.只有高危人群易感

D.只有性传播疾病患者易感

E.青少年易感

答案

参考答案：A

单项选择题

Your vessel is equipped with a fixed CO2 system and a fire main system. In the event of an electrical fire in the engine room what is the correct procedure for fighting the fire?（）

A.Use the CO2 system and evacuate the engine room

B.Use the fire main system and evacuate the engine room

C.Evacuate the engine room and use the CO2 system

D.Evacuate the engine room and use the fire main system
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判断题

尾部受热面的低温腐蚀是由于SO2氧化成SO3，而SO3又与烟气中蒸汽结合，形成酸蒸汽。
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