![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495fbf56b3023539b59f7bcee29acc70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8895012fe533f8fc3a867ac1cf6fb8fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3cde20d4845bdcc36c686d9c63c29fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937eadbebb4c2352f97257c1b66e36d9.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/12/0096cf64-e53d-4088-b9ce-643e36ca5f75.png?resizew=281)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b3a56559be3dcb75c70196aaa0f996.png)
4 . 从椭圆的一个焦点发出的光线,经过椭圆反射后,反射光线经过椭圆的另一个焦点;从双曲线的一个焦点发出的光线,经过双曲线反射后,反射光线的反向延长线经过双曲线的另一个焦点.如图①,一个光学装置由有公共焦点、
的椭圆
与双曲线
构成,现一光线从左焦点
发出,依次经
与
反射,又回到了点
,历时
秒;若将装置中的
去掉,如图②,此光线从点
发出,经
两次反射后又回到了点
,历时
秒:若
,则
的长轴长与
的实轴长之比为( )
A.![]() | B.![]() | C.![]() | D.![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59441ebf242e86562be7d34520a1e886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5022abc6afd4deff13845419fa38312e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85930ac62b4be430db2e6a8c66484add.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/b36550f4-7ea6-43f4-9df9-af624b0712de.png?resizew=358)
A.![]() | B.![]() | C.![]() | D.![]() |
6 . 某校兴趣小组运用计算机对轮船由甲地海湾行驶入乙地海湾进行了一次模拟试验.如图,乙地海湾的入口处有暗礁,其中线段AA1,B1B,CC1,D1D分别关于坐标轴或原点对称,线段B1B的方程为y=x,x∈[a,b],b>a>0,过O有一条航道.有一艘正在甲地海湾航行的轮船准备进入乙地海湾,在点M(-a,0)处测得该船发出的汽笛声的时刻总比在点N(
a,0)处晚1 s(设海面上声速为a m/s).若该船沿着当前的航线航行(不考虑轮船的体积),则兴趣小组观察到轮船当前航线所在的轨迹是什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8091a8f85b18aad197b9ff3ef372152d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61175736f35810e37d3f0df83e4b8e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3040b6c904477030ecf8ba20b2b18759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789c2e82fd40059e4b79a473b1e8f26f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee05b3210c8964deef8ff771173d288.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/0741001d-be63-4636-894b-36a9b8f77616.png?resizew=193)
A.4米 | B.![]() | C.![]() | D.![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/8/95027e4d-05c1-4e61-9d2d-b8d2a921b063.png?resizew=123)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d8abc12096bc7ae617b30eeb8f9714.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/67598b0b-5dac-4fcb-87e4-c8f22cb61449.png?resizew=214)