如图是一个汽油桶的截面图,其上方有一个进油孔,该汽油桶的截面直径为
,此时汽油桶内液面宽度
,现在从进油孔处倒油,当液面
时,液面上升了__________
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa95be1c601e402b5ffddddeb1af87d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/393fd7ddedf8ff07ef8c51c10dfb9eec.png)
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更新时间:2016-12-06 03:45:53
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