题型:单选题
难度:0.85
引用次数:1814
题号:11005303
一艘海轮从A处出发,以每小时40海里的速度沿南偏东40°的方向直线航行,30分钟后到达B处,在C处有一座灯塔,海轮在A处观察灯塔,其方向是南偏东70°,在B处观察灯塔,其方向是北偏东65°,那么B,C两点间的距离是( )
A.10![]() | B.10![]() |
C.20![]() | D.20![]() |
更新时间:2020-08-29 11:05:35
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单选题
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较易
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【推荐1】如图,设
、
两点在河的两岸,一测量者在
的同侧,在所在河岸边选定一点
,测出
的距离为
,
,
后,就可以计算
、
两点的距离为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/15415f02-842d-4016-a802-8deb70e1f431.png?resizew=140)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af6f5c0af6ad774fdf92ad610f6d95d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4c0122aeefeaf1b75ce0b7062216df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c470828d00e7d61f88cd725462b0c7c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/15415f02-842d-4016-a802-8deb70e1f431.png?resizew=140)
A.![]() | B.![]() |
C.![]() | D.![]() |
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单选题
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【推荐2】某船从A处向北偏东
方向航行
千米后到达B处,然后朝南偏西
的方向航行6千米到达C处,则A处与C处之间的距离为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
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A.![]() | B.![]() | C.3千米 | D.6千米 |
您最近一年使用:0次