问题提出:
中,
,
为
边上的高,点E为
的中点,连接
交
于点O,则
的长为___________;
问题探究:
(2)如图②,在正方形
中,
,点P为正方形内一点,当
时,求
的最小值;
问题解决:
(3)如图③,四边形
是某现代农业生态园部分平面示意图,其中
,
,
,
,
米,
的中心O是一座有机蔬菜餐厅,生态园的入口M是
上的中点,
是一条有机蔬菜展览走廊,
是一条循环生态河,现需要在
边上取点E,
上找点P,修建道路
,为了节省成本需要修建的道路最短,即
的值最小;是否存在这样的点E、P,使得
的值最小?若存在请求出
的最小值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
问题探究:
(2)如图②,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd864f5813e3050f6f6d570a4bdc010c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a13ec9a812274ad0839f20ba17348687.png)
问题解决:
(3)如图③,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/113bb722c5f69f4e53cb01c2dcba810f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92157235c4246c5e203d3f354d29db2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e9f73a7bb7df51a0f6d490d01b271f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e9f73a7bb7df51a0f6d490d01b271f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e9f73a7bb7df51a0f6d490d01b271f.png)
更新时间:2023-04-10 21:06:40
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图1,
为等边三角形,D为AC右侧一点,且
,连接BD交AC于点E,延长DA、CB交于点F.
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947478415712256/2949500209004544/STEM/fb691228-0624-41fd-a16e-42acea4c0179.png?resizew=391)
(1)若
,
,求AD;
(2)证明:
;
(3)如图2,若
,G为BC中点,连接AG,M为AG上一动点,连接CM,将CM绕着M点逆时针旋转90°到MN,连接AN,CN,当AN最小时,直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc13fe21e64d9b45614ed43be847904.png)
![](https://img.xkw.com/dksih/QBM/2022/3/30/2947478415712256/2949500209004544/STEM/fb691228-0624-41fd-a16e-42acea4c0179.png?resizew=391)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f80a9b3e17fca568e05477eaf317a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f414cce1427646590a7f7144efe2e26.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12f79d2ad4c864f3b9ec14f99063da87.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
真题
【推荐2】如图,已知抛物线:
与x轴交于点A,
(A在B的左侧),与y轴交于点C,对称轴是直线
,P是第一象限内抛物线上的任一点.
(2)若点D为线段
的中点,则
能否是等边三角形?请说明理由;
(3)过点P作x轴的垂线与线段
交于点M,垂足为点H,若以P,M,C为顶点的三角形与
相似,求点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ba23d524dc2a51f2a2f5a2eec842f22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852b303689c31189cd47bb4a3220f9fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b650820d7bed48ed67a2869ad8c65ff1.png)
(2)若点D为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf1c00108ec0fe5eefe9281ca2b1b6c.png)
(3)过点P作x轴的垂线与线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4482d899598b7ddfff953f5a8face743.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
名校
【推荐1】如图,点
是菱形
对角线
上一动点,
.在线段
的同侧做线段
,使得
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/55f3da4e-018a-4411-b36e-3c3bd17bb958.png?resizew=424)
(1)补全图形,并回答问题:当
____________时,
;
(2)连接
,交
于点
,若
,探索
与
的数量关系,并证明;
(3)直接写出当
___________时,
将平行
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18444ec3e5e3b8a0cf488732c34866d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/138c0d201baff3e0f7b9de6544317fbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245f4d72057dc79b305fb0e1e7809d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/30/55f3da4e-018a-4411-b36e-3c3bd17bb958.png?resizew=424)
(1)补全图形,并回答问题:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f76e37d6e6b182896ccaaa187cfe07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d216511526a5834a019505223197d45.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0246970f221426ba16e6619a877e76c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)直接写出当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4f76e37d6e6b182896ccaaa187cfe07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图1,矩形的边OA在x轴上,边OC在y轴上,点B的坐标为(6,8).D是AB边上一点(不与点A、B重合),将△BCD沿直线CD翻折,使点B落在点E处.
(1)求直线AC所表示的函数的表达式;
(2)如图2,当点E恰好落在矩形的对角线AC上时,求点D的坐标;
(3)如图3,当以O、E、C三点为顶点的三角形是等腰三角形时,求△OEA的面积.
(1)求直线AC所表示的函数的表达式;
(2)如图2,当点E恰好落在矩形的对角线AC上时,求点D的坐标;
(3)如图3,当以O、E、C三点为顶点的三角形是等腰三角形时,求△OEA的面积.
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐1】【获取新知】如图①,在四边形
中,
,点E、F分别是
、
的中点,连结
,则
.获取这一结论,可以连结
并延长交
的延长线于点G,从而转化为三角形的中位线解决.请你完成这个结论的证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/4b8c9b48-ce77-4746-bf6b-c6115cca68ff.png?resizew=556)
【旧知铺垫】
如图②,在
中,
,分别以
、
为边向外作正方形
、正方形
,连结
,点M是
的中点,
于点N,若
,
,求
的长.
【新知应用】
如图③,在
中,
,分别以
、
为边向外作正方形
、正方形
,连结
,点M是
的中点,
于点N.若
,
,则
的长为_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e521dd2c2c031824ccdbfd606f851345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/4b8c9b48-ce77-4746-bf6b-c6115cca68ff.png?resizew=556)
【旧知铺垫】
如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a34fdf9e6d2d87d01ad0bbb6a73ee05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf271d6475f5305bc922677b4cfe28c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
【新知应用】
如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9d54cbbf601f4583659771eb534997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a34fdf9e6d2d87d01ad0bbb6a73ee05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf271d6475f5305bc922677b4cfe28c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】已知四边形
是边长为1的正方形,点E是边
上的动点,以
为直角边在直线
的上方作等腰直角三角形
与
分别相交于点P、Q,连接
,过点A作
,垂足为点M,过点P作
,垂足为点N,设
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/b7a6c8dc-b6df-46df-8c3b-096f99a8d5e9.png?resizew=198)
(1)求
的长;
(2)用含有m的代数式表示
;
(3)用含有m的代数式表示
,并求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c6af6193c86ac1dbd1c20fc77ac6c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57db9134786f18237bd709544fdcf641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9cf1bdc2b9dbec7fd2a7b387d72176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc2d9d9adad09281ca67132bdce523fe.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/b7a6c8dc-b6df-46df-8c3b-096f99a8d5e9.png?resizew=198)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(2)用含有m的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
(3)用含有m的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图,已知线段AB=2,MN⊥AB于点M,且AM=BM,P是射线MN上一动点,E,D分别是PA,PB的中点,过点A,M,D的圆与BP的另一交点C(点C在线段BD上),与MN的另一个交点R,连结AC,DE.
(1)当∠APB=28°时,求∠B的度数和弧CM的度数.
(2)求证:AC=AB.
(3)若MP=4,点P为射线MN上的一个动点,
①求MR的值
②在点P的运动过程中,取四边形ACDE一边的两端点和线段MP上一点Q,若以这三点为顶点的三角形是直角三角形,且Q为锐角顶点,求此时所有满足条件的MQ的值.
(1)当∠APB=28°时,求∠B的度数和弧CM的度数.
(2)求证:AC=AB.
(3)若MP=4,点P为射线MN上的一个动点,
①求MR的值
②在点P的运动过程中,取四边形ACDE一边的两端点和线段MP上一点Q,若以这三点为顶点的三角形是直角三角形,且Q为锐角顶点,求此时所有满足条件的MQ的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/462b6b5e-303c-4127-ad3b-eb0b5dfb585a.png?resizew=513)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】【问题背景】
如图1,在
中,以
的三条边分别作正方形
、正方形
和正方形
,连接
.设
面积为
,
的面积为
.
【问题发现】
(1)如图1,若
,则
与
满足的数量关系为 ;
【深入探究】
(2)如图2,若
(
为锐角),则
与
是否还满足(1)中的数量关系,并说明理由;
【拓展运用】
(3)在(1)的条件下,如图3,直线
分别相交于
,若
,
,求
的面积.
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341d18ccb14670a1c7364efd33140921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dae7f709cd4bf123f329605b2f9ea679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bce074d029fd48029eb7275dda15fe8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
【问题发现】
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
【深入探究】
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d32993a87a53ae4aab52e8c717aa68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
【拓展运用】
(3)在(1)的条件下,如图3,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd239342cd223a13e3f9e4ffc7d06c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dfe53f4c1f060e6d7cf7933d4c93262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72f02ad5ced321b7fcc960742533a0d.png)
您最近一年使用:0次