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单选题 椭圆
的左焦点坐标是( )
学科：默认课程
时间：2026-04-28 01:40:57
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题目1单选题
双曲线 <img src="https://tihai-oss-cloud.itihey.com/img/bf21e7373d8ba24f6eed6299eca43f0c.png"> 的离心率是( )A. 2B. <img src="https://tihai-oss-cloud.itihey.com/img/884b69fe0ccc1cd16a7ff58cdfc14230.png">C. 3D. <img src="https://tihai-oss-cloud.itihey.com/img/3f3f9f1f9a8becb70b8a5dadb411d33a.png">
题目2单选题
"x=2"是"x²=4"的( )条件A. 既不充分也不必要B. 必要不充分C. 充分不必要D. 充要
题目3单选题
椭圆<img src="https://tihai-oss-cloud.itihey.com/img/0957619f10028129b943206fe5bada8d.png">的左焦点坐标是( )A. (0, -2)B. (-3, 0)C. (-2, 0)D. (0, -3)
题目4单选题
双曲线 <img src="https://tihai-oss-cloud.itihey.com/img/fb662746049ba715a3f46901e2a76e8d.png"> 的渐近线方程是( )A. <img src="https://tihai-oss-cloud.itihey.com/img/236e699db4ba7792d63fa1ba300e77da.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/3867e7662dc8cdcf645cdd098e6aa185.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/247765316ea26eec57cb330cd3217faa.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/84bccca0a8bb00b82bb355fae044075f.png">
题目5单选题
"付了足够的钱"是"能买到商店里的东西"的( )条件A. 充要B. 充分不必要C. 既不充分也不必要D. 必要不充分
题目6单选题
双曲线 <img src="https://tihai-oss-cloud.itihey.com/img/1e8d9f0c2816c7a0f02c0870df3e6637.png"> 的焦点坐标是( )A. <img src="https://tihai-oss-cloud.itihey.com/img/36db547b950599c6619858b214531fff.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/c17f46eea16394fb9d04e357282d9248.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/4c06be8f019ea9059b78797102a066ee.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/ec60d5ffa780e3436247406759e0a92e.png">
题目7单选题
下面各种量中,哪个不是向量<img src="https://tihai-oss-cloud.itihey.com/img/aa033b1e67a13e2a6bde3b7a8e0e0109.webp">A. 质量B. 力C. 速度D. 位移
题目8单选题
已知点<img src="https://tihai-oss-cloud.itihey.com/img/ae1e867f2730c4f0b1b9c1038a4c0c7d.webp">,点<img src="https://tihai-oss-cloud.itihey.com/img/b217ac7e7b6f21ac88d26dc5f18604e4.webp">满足<img src="https://tihai-oss-cloud.itihey.com/img/83c84a9a3e59cdde8956d481d9274ea0.png">,则<img src="https://tihai-oss-cloud.itihey.com/img/b217ac7e7b6f21ac88d26dc5f18604e4.webp">点坐标为<img src="https://tihai-oss-cloud.itihey.com/img/aa033b1e67a13e2a6bde3b7a8e0e0109.webp">A. <img src="https://tihai-oss-cloud.itihey.com/img/8bd2ea29fe368304d88d929423cf353e.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/21bdbbd42ba3db67c50e4a0fd84c3483.webp">C. 无法确定D. <img src="https://tihai-oss-cloud.itihey.com/img/849f7d11018d7b337ed669a2911e6801.webp">
题目9单选题
双曲线 <img src="https://tihai-oss-cloud.itihey.com/img/372a4de8a3e911c9cc516a1d99593a54.png"> 的虚轴长是( )A. 4B. 8C. 6D. 3
题目10单选题
复数 |3 - 4i| 的模是( )A. 25B. 12C. 7D. 5
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