单选题:商业楼.展览楼.综合楼.一类建筑的财贸金融楼.图书馆.书库.重要的档案楼.科研楼和旅馆的消防水泵火灾时持续运行时间为()

题目内容:

商业楼.展览楼.综合楼.一类建筑的财贸金融楼.图书馆.书库.重要的档案楼.科研楼和旅馆的消防水泵火灾时持续运行时间为()。 A.1H
B.2H
C.3H
D.4H

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