如图,一船在海上自西向东航行,在
处测得某岛
的方位角为北偏东
角,前进
千米后在
处测得该岛的方位角为北偏东
角.已知该岛周围
千米范围内(包括边界)有暗礁.现该船继续东行.当
与
满足下列__________ (填序号)条件时,该船没有触礁危险.
![](https://img.xkw.com/dksih/QBM/2016/11/14/1573146910629888/1573146916020224/STEM/c5914110ea1648168887dd08f3c656c2.png?resizew=178)
(1)
;
(2)
;
(3)
;(4)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://img.xkw.com/dksih/QBM/2016/11/14/1573146910629888/1573146916020224/STEM/c5914110ea1648168887dd08f3c656c2.png?resizew=178)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f5f44e740850dc4831f7e98e0937e3.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2e8b4ed6ddd3eb40626ef84daf5120.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0db5265b89e1263ac033875e089f52b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce835832032b148cd69d2825c633370.png)
更新时间:2016-12-05 00:38:30
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【推荐2】如图,在
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