《列子·汤问》记有古代传说:“渤海之东,不知几亿万里,有大壑焉,实为无底之谷,其下无底,名曰归墟.”现代研究发现海洋蓝洞是海底突然下沉的巨大“深洞”,从海面上看蓝洞呈现出与周边水域不同的深蓝色,我国西沙群岛的“三沙永乐龙洞”为世界最深的海洋蓝洞,深达
.若要测量如图所示的蓝洞的口径
、
两点间的距离,现在珊瑚群岛上取两点
、
,且
、
、
、
四点共面,测得
,
,
,
,则
、
两点间的距离为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b64d99216f93a7a39c7f31bd96647ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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19-20高三·江西南昌·阶段练习 查看更多[1]
(已下线)江西省南昌市龙门教育2020届高三下学期第一次联考数学(文)试题
更新时间:2020-04-01 12:24:38
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【推荐2】海上一观测站
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