用于防火卷帘的水幕泵火灾时持续运行时间为（）。
A.1h
B.2h
C.3h
D.4h
参考答案：C
解析：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3h，其他高层建筑为2h；用于防火卷帘的水幕泵火灾时持续运行时间为3h；消防电梯火灾时持续运行时间应大于消防水泵、水幕泵火灾时持续运行时间；建筑高度大于100m的民用建筑，加压风机、防排烟机火灾时持续运行时间要大于90min；医疗建筑、老年人建筑、总建筑面积大于100000m2的公共建筑，火灾时持续运行时间要大于60min；其他建筑要大于30min。
Hobbies are activities（活动）, which we do in our free time. There are so many kinds of hobbies one can choose for his or her own. Some hobbies are really expensive, and some are even dangerous. The most popular hobbies in our country are as follows: Collecting hobbies We can collect a lot of things. Usually people collect the stamps, postcards or coins. Some people collect unusual things like old cars, old motorbikes or other interesting things, which could be very expensive. Art hobbies Going to the theatre, concert（音乐会）, opera; playing some instrument ( the most popular instrument is guitar ); painting, writing, poetry. There are many clubs—such as singing, dancing, etc. Sports games Everybody do some sport activities—sport can keep us fit. Many students are members of a sports club—basketball, volleyball or swimming. The other popular hobby is watching TV or a video, playing computer or video games, but it is not so good for your eyes and your mind. Many people here like to spend their free time reading books, magazines and newspapers. Some people like listening to music better. Going out can be very expensive now. Many students would like to make use of their hobbies in their future jobs, e.g. working with computer, but it is not so easy. Hobbies are very important for everybody. A man would be very poor without a hobby and would not be pleased.
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