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们兴奋昴扬的情绪,帮助我们工作活动;晚上,它用西落为我们带来静谧安宁。在人类演进历史中,一直习惯于太阳光下的感觉,即使是在高度文明的现代社会,人类的这种基本生理节奏也会因为自然光规
http://blog.alighting.cn/phoebe_yy/archive/2008/9/8/9053.html2008/9/8 10:14:00
体育场夜间照明由200多个“无影灯”提供。为保证比赛照明万无一失,这些照明用灯为两路供电,当一路出现故障时,另外一路立即启动。即便两路供电系统都出现故障,体育场还有备用发电机提供电
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