1 . 气象台
在早上8:00观测到一台风,台风中心在气象台
正西方向
处,它正向东北方向移动,移动速度的大小为
;距离台风中心
以内的地区都将受到影响.若台风中心的这种移动趋势不变,该气象台受到台风影响的时段为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f69e03c1a32bbb2056a5e4e3d872295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d3706448b19fd71be9684aec98a1ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c55fd73aaa0600269ec423d6a0d4f95.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 在凸四边形ABCD中,
,E,F分别是边AD,BC的中点,
,若以AB,CD为边分别画两个正方形
,
,再画一个长度、宽度分别为AB,CD的长方形
,则所画三个图形
,
,
的面积之和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfc23ee1f558ade7f23b192bfa0ec61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2e6618b5423b14a547cd06a2118b62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f435efcc7869eec21bdba1ed81dc3f5.png)
A.7 | B.14 | C.21 | D.28 |
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