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沙漏计时器由上下两个大小相同、相互连通且底面互相平行圆锥组成
【2019四川下-48】如图，沙漏计时器由上下两个大小相同、相互连通且底面互相平行的圆锥组成，下面的圆锥内装有细沙。计时开始时，将沙漏倒置，已知上面圆锥中细沙全部流下恰好需要1小时，则细沙高度下降一半所需的时间是： A.30分钟 B.45分钟 C.47.5分钟 D.
公务员考试数量关系刷题组10/53
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