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坐电梯
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坐电梯. 还是. 走楼梯. ？. VS. 越来越高. 摩天大楼. 越来越多. 目录. 越发常见. 电 梯. 乘坐电梯 —— 利 or 弊 ？. 能源、环境危机. 低碳环保，健康生活. 生命在于运动. 每天爬楼 10 分钟 健康身体加一分！. 促进骨骼发育 远离肥胖 预防心脑血管疾病 提高身体抵抗力. 生命更有活力！. 电梯效能对比. 楼层越低 电梯相对耗能越 大 ！. 走楼梯所需要做的功. 乘电梯需要的功. 注释：满载 13 人（ 1000kg ） 中途无人出入 楼层高 —3m/ 层.
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坐电梯
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