1 . 如图,在棱长为1的正方体
中,E,F,K分别为线段
的中点,下列四个结论:①直线
共点;②直线
为异面直线;③四面体
的体积为
;④线段
上存在一点N使得直线
平面
.其中所有正确结论的序号为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b14da20efab87c75b6852155c889e97b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9406e24d6c5d85bb416343552c1ec854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0f5cdb2bbcc88050210824477b91ed7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d7abf02717d6e59d8a64a65a87c412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ae72f5e5891249caa10c43224da89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae39b47a4da24a0647620f09fd0029c0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/458d499f-e901-4314-8cc7-4531750c5069.png?resizew=157)
您最近一年使用:0次
2 . 已知长方体
中,侧面
的面积为2,给出下列四个结论:
①当
为
的中点时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
平面
;
②若三棱柱
的体积为2,则点
到平面
的距离为3;
③若
,且在棱
上存在一点
,满足
,则四棱锥
外接球的体积为
;
④若在棱
上存在一点
,使得
为等边三角形,则四棱锥
外接球表面积的最小值为
.
所有正确命题的编号为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923189afc198d153c79059a827f63c87.png)
②若三棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad91719bd5fdc1b2d3d5298f2f44cc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c44d63134e34952eec37a89686b6a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbcffe417a02e199bcaf2c268cdb3aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67fb457e8ac0d3ac35e1c668ea138f91.png)
④若在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3e2b2689dfe97ec82d473ab6cf469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbcffe417a02e199bcaf2c268cdb3aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192e717198303c0ed6150af13c6f969d.png)
所有正确命题的编号为
您最近一年使用:0次
3 . 如图,在棱长为2的正方体
中,
,
分别是棱
,
的中点,点
在
上,点
在
上,且
,点
在线段
上运动,给出下列四个结论:
![](https://img.xkw.com/dksih/QBM/2024/2/3/3425106637709312/3430232655585280/STEM/6a2e8f2b25ea4ba38813b3d8db0782ea.png?resizew=162)
①当点
是
中点时,直线
平面
;
②直线
到平面
的距离是
;
③存在点
,使得
;
④
面积的最小值是
.
其中所有正确结论的序号是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b20bec6da0e92b220021ab497e1ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3adea2cdc3b64f1bf79265d4cb1425ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/2024/2/3/3425106637709312/3430232655585280/STEM/6a2e8f2b25ea4ba38813b3d8db0782ea.png?resizew=162)
①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b54387f870ae37f7951b253665d64f6.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
③存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae1adc3dbbcbb2571fe2900fd3c5be1.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ba2d49042c812a164167a8e42fde290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3740691124a5ed24347bffe5d55af3.png)
其中所有正确结论的序号是
您最近一年使用:0次
4 .
,
为两个不同的平面,
,
为两条不同的直线,下列命题中正确的个数是________ .
①若
,
,则
; ②若
,
,则
;
③若
,
,则
; ④若
,
,
,则
.
![](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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/202af51f5ebe87ec0017f439a6ad7fbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b1abe635d973a6ec347b597982fdc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb088614157a85ed7cb11802e49a2981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af680499446f4f2cd3c3d6cb37905efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a042a14e1c3c915ad11544c9e1e57da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0205571fa39f343ee5749b78d466bf0.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0205571fa39f343ee5749b78d466bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b59b1a01a6da42ff2a41e5b91ea301ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3bdd7a1a12d66a8b32e239fd6886a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84b6e422b2e6f6dada4d8c369559a077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1b610e3c5b3d78a5730e7f3d736ac28.png)
您最近一年使用:0次
2023-08-15更新
|
215次组卷
|
2卷引用:天津市天津经济技术开发区第二中学2023届高三上学期期中数学试题
名校
5 . 如图,在棱长为2的正方体
中,
、
、
分别是
,
,
的中点,
是线段
上的动点,则下列命题:
①不存在点
,使
//平面
;
②三棱锥
的体积是定值;
③直线
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ce50ba5e349425274f05d46d120a74.png)
④经过
、
、
、
四点的球的表面积为
.
正确的是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94ce22f30a8de2af135de3c89403aff.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/25/e0c2cf53-8d74-41d8-a86e-021f04c24043.png?resizew=155)
①不存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/babea91663e479b0018ebac5e36374d5.png)
②三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbec5322800f0a88b7006bdb0a8de0fb.png)
③直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565133e91e3ace2b2187cfc6f1db5be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ce50ba5e349425274f05d46d120a74.png)
④经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e95a79288fcb7e47fba4410722e2bc6.png)
正确的是
您最近一年使用:0次
2023-07-23更新
|
182次组卷
|
4卷引用:黑龙江省佳木斯市第一中学2022届高三第三次模拟数学(文)试题
黑龙江省佳木斯市第一中学2022届高三第三次模拟数学(文)试题(已下线)第03讲 直线、平面平行垂直的判定与性质(练)四川省射洪中学校2023届高三上学期第三次月考文科数学试题四川省成都市天府新区实外高级中学2024届高三上学期10月月考数学(文)试题
名校
解题方法
6 . 如图,在长方体
中,底面
为正方形,E,F分别为
,CD的中点,点G是棱
上靠近
的三等分点,直线BE与平面
所成角为
.给出以下4个结论:
平面
; ②
;
③平面
平面
; ④B,E,F,G四点共面.
其中,所有正确结论的序号为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4cd2b33bd983a9ed6575b9de04a46a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca871e5520b69dada15eca7faa423b2b.png)
③平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557e120c066e17ba3eee00410cbed573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c1acd7da8817385417e1dff25bfe25.png)
其中,所有正确结论的序号为
您最近一年使用:0次
2022-12-30更新
|
1790次组卷
|
9卷引用:四川省广安市2023届高三第一次诊断性考试数学(文)试题
四川省广安市2023届高三第一次诊断性考试数学(文)试题四川省眉山市2023届高三第一次诊断性考试数学(文)试题四川省资阳市2023届高三第二次诊断性考试文科数学试题四川省雅安市2023届高三第一次诊断性考试数学(文)试题四川省泸县第一中学2023届高三二诊模拟考试数学(文)试题第8章 立体几何初步 章末测试(提升)-2022-2023学年高一数学一隅三反系列(人教A版2019必修第二册)(已下线)8.6.3平面与平面垂直(第1课时平面与平面垂直的判定定理)(精讲)(2)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)(已下线)第8章 立体几何初步 单元综合检测(重点)-《重难点题型·高分突破》(人教A版2019必修第二册)单元测试A卷——第八章?立体几何初步
名校
解题方法
7 . 在正方体
中,
为正方形
的中心.动点
沿着线段
从点
向点
移动,有下列四个结论:
①存在点
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e7d02e9e51072b4c6c25dfee05b77cc.png)
②三棱锥
的体积保持不变;
③
的面积越来越小;
④线段
上存在点
,使得
,且
.
其中所有正确结论的序号是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d609847e2ff3d64e5a514582c3ead0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a122e25cf4eb9f03ffe5ec823bfc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
①存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e7d02e9e51072b4c6c25dfee05b77cc.png)
②三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebb7ec039a06be81be737d6902a33430.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ad53e9745d0db9ff5ed73e099b92e3f.png)
④线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198bf739bc00bf9af2a328944e4d1385.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a852d1b8ad5024dfba55360e56322ea3.png)
其中所有正确结论的序号是
您最近一年使用:0次
2022-12-29更新
|
639次组卷
|
3卷引用:北京市大兴区2023届高三上学期期末检测数学试题
北京市大兴区2023届高三上学期期末检测数学试题北京市第一零一中学2023-2024学年高三上学期数学统练五(已下线)1.2.1 空间中的点、直线与空间向量(分层训练)-2023-2024学年高二数学同步精品课堂(人教B版2019选择性必修第一册)
名校
8 . 正方体中,
是棱
的中点,
是侧面
内的动点,且
平面
,若正方体
的棱长是2,则
的轨迹被正方形
截得的线段长是
您最近一年使用:0次
名校
9 . 如图,在棱长为2的正方体
中,M,N分别是线段
,
的中点,
是线段
上的动点,过M,N,E的平面
截正方体
所得的截面面积记为
.当
为线段
的中点时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
______ ;当
在线段
(包括端点)上运动时,
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/09e0b5e9-06dc-4ed3-9ff9-c44fbed5e242.png?resizew=151)
您最近一年使用:0次
2022-12-25更新
|
734次组卷
|
3卷引用:北京市八一学校2023届高三上学期12月月考数学试题
2022高三·全国·专题练习
10 . 如图,透明塑料制成的长方体容器
内灌进一些水,固定容器底面一边BC于地面上,再将容器倾斜.随着倾斜度的不同,有下面五个命题:
(2)没有水的部分始终呈棱柱形;
(3)水面EFGH所在四边形的面积为定值;
(4)棱
始终与水面所在平面平行;
(5)当容器倾斜如图(3)所示时,
是定值.
其中所有正确命题的序号是______,为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
(2)没有水的部分始终呈棱柱形;
(3)水面EFGH所在四边形的面积为定值;
(4)棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
(5)当容器倾斜如图(3)所示时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6023cc692a2169e0c2e4ec1bdf9c3f1.png)
其中所有正确命题的序号是______,为什么?
您最近一年使用:0次