2023高三·全国·专题练习
1 . 已知
为坐标原点,垂直抛物线
的轴的直线与抛物线
交于
两点,
,则
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37ab7408ffcefcb8e5e1ad4a9c58f1b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc11e7549cfce9220e70250ac943e457.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57dfc9d1109fe41145cc892b5702d9fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
A.4 | B.3 | C.2 | D.1 |
您最近一年使用:0次
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2 . 一种卫星接收天线如图所示,其曲面与轴截面的交线为抛物线.在轴截面内的卫星波束呈近似平行状态射入形为抛物线的接收天线,经反射聚集到信号装置(信号装置安装在抛物线的焦点处).已知接收天线的口径(直径)为
,深度为
,则信号装置与卫星接收天线中心
的距离为( ).
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645074691039232/2646030382014464/STEM/33834891-98f1-45d0-9ca4-927ba167578b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/822b2b5981c9685909ba8ad1df4adb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c6e4ecd4a91b0eb74f0d32e5da9b99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645074691039232/2646030382014464/STEM/3e72ca4e719b4257a01c0be9fe3dfd88.png?resizew=130)
![](https://img.xkw.com/dksih/QBM/2021/1/27/2645074691039232/2646030382014464/STEM/33834891-98f1-45d0-9ca4-927ba167578b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2021-01-28更新
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532次组卷
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3卷引用:福建省莆田市第二中学2022-2023学年高二上学期第二次月考数学试题