问题
多项选择题
无线局域网络系统的适用场合是哪些（）
A、会议室、地铁候车月台、商业中心
B、展览馆、发布中心等大空间场合
C、酒店大堂、咖啡屋等
D、户外快速移动的场合（如车辆、船舶内）
答案
参考答案：A, B, C
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无线局域网络系统的适用场合是哪些（）
A、会议室、地铁候车月台、商业中心
B、展览馆、发布中心等大空间场合
C、酒店大堂、咖啡屋等
D、户外快速移动的场合（如车辆、船舶内）
参考答案：A, B, C
Air is all round us．It is around us___31____we walk and play．From the time we are born，air is around us on every side．When we sit down，it is around us．When we go to bed．air is 32 around us．We live 33 air． All living things 34 air．Living things cannot live 35 air．We can live without any water for 36 days，but we cannot live for more 37 a few minutes without air．When we are working 38 running，we need more air．When we are asleep，we need less air We live in air but we cannot see it．We can only feel it．We can feel it when it is 39 ． Moving air 40 wind．
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