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在半径为27m的圆形广场中央点O的上空安装了一个照明光源S,S′射向地面的光束呈圆锥形,其轴截面SAB的顶角为120°(如图).求光源离地面的垂直高度SO(精确到0.1m,2=1.414,3=1.732,5=2.236
人气:496 ℃ 时间:2020-06-12 22:25:56
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