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【单选题】
泡沫灭火系统是采用泡沫液作为灭火剂，主要用于扑救( )。A.
固体表面和电器设备火灾
B.
非水溶性可燃液体火灾
C.
图书馆珍藏室火灾
D.
底层设置商业服务网点的住宅火灾
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Listen to a long conversation and choose the best answer to each question you hear. B1-U6_3_2.mp3: Q: Why did the woman decide to do a triathlon?
A.
Because she did it in college.
B.
Because she wanted to be tough.
C.
Because her sister did it and liked it.
D.
Because her sister said it was good for her.
【简答题】（2009?重庆）下列物质中碱性最强的是（ ）
【单选题】B1-U6_3_3_1.mp3: Q: What is the ratio of positive to negative emotions that can make a person happier?
A.
01:03
B.
03:01
C.
01:10
D.
10:01
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