解题方法
1 . 如果
是离散型随机变量,则
在
事件下的期望满足
其中
是
所有可能取值的集合.已知某独立重复试验的成功概率为
,进行
次试验,求第
次试验恰好是第二次成功的条件下,第一次成功的试验次数
的数学期望是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0010cb466163db1349fc1040f6b439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a71f2ff30791e8b210727912600096.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ad71223cc853bc21bf203e7a5321f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385f040f4037e9934620d6971da08131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
您最近一年使用:0次
2 . A,B,C为
内角,x,y,z为实数,求以下三式中恒成立的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad95998658d2ab5aad3714e2276bb6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5870e3149fc4cec4c7066ea95db8e5c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad95998658d2ab5aad3714e2276bb6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5870e3149fc4cec4c7066ea95db8e5c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df217a60bbc39645dd98a10ebc809e5.png)
您最近一年使用:0次
解题方法
3 . 对集合
,定义其特征函数
,考虑集合
和正实数
,定义
为
和式函数.设
,则
为闭区间列;如果集合
对任意
,有
,则称
是无交集合列,设集合
.
(1)证明:L和式函数的值域为有限集合;
(2)设
为闭区间列,
是定义在
上的函数.已知存在唯一的正整数
,各项不同的非零实数
,和无交集合列
使得
,并且
,称
为
和式函数
的典范形式.设
为
的典范数.
(i)设
,证明:
;
(ii)给定正整数
,任取正实数
和闭区间列
,判断
的典范数
最大值的存在性.如果存在,给出最大值;如果不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1304eb00ab95d664dc84385f602a8f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f69939291758b5eaa19146f76709e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9304e71a623c4412188a800046a970d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee6c8ae5004f2ffe7f8392b4d3c39b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238908949859936af0e109ef684599b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f69939291758b5eaa19146f76709e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f69939291758b5eaa19146f76709e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/937c09d82c480e4d67f8a48d3f66c5f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a02da5d46478a54d279755a295d548f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1b56da93ba7a2dec958070eb2666240.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05386869739fb11a190c637ba8a93174.png)
(1)证明:L和式函数的值域为有限集合;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f69939291758b5eaa19146f76709e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b4010030e10725398b64d4dcc09429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0fa51de98f090eda3e3f60a26475db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecfcda4333678bafacc4c676c2836977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee06844034f61cab7d421d55179ee367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/359a16305129aeea0953efd9100f4b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b4e32041b54703ade8e8c2cee01f13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ed82555c7d6fc6b449fbdb1f68fef1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b4010030e10725398b64d4dcc09429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b4010030e10725398b64d4dcc09429.png)
(i)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1462612f3654548c39489985987cb67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7870c36161f465fc992534b5fc3777f3.png)
(ii)给定正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9304e71a623c4412188a800046a970d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f69939291758b5eaa19146f76709e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20b4010030e10725398b64d4dcc09429.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
4 . 设有两个集合
,如果对任意
,存在唯一的
,满足
,那么称
是一个
的函数.设
是
的函数,
是
的函数,那么
是
的函数,称为
和
的复合,记为
.如果两个
的函数
对任意
,都有
,则称
.
(1)对
,分别求一个
,使得
对全体
恒成立;
(2)设集合
和
的函数
以及
的函数
.
(i)对
,构造
的函数
以及
的函数
,满足
;
(ii)对
,构造
的函数
以及
的函数
,满足
,并且说明如果存在其它的集合
满足存在
的函数
以及
的函数
,满足
,则存在唯一的
的函数
满足
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc020b0997a2f37b214718112b79d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2317480af8719266bb92ee59d6b2c3b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf13fc6f6469b51cba724df6701f2016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4ff0af96ea467337cb30c4c765b5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acae4bf2a6bead9d904b70d0480fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f484115a9df1b6060d6b14df85c6f38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acae4bf2a6bead9d904b70d0480fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b9b582f8426f1269b54ee910b97f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5609d6ec9ef33f11e359f35d27289623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e50933c5e999ca64d3046fe1fa84dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169ccf0e6e7ada48126feac1e67de0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4ff0af96ea467337cb30c4c765b5f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c775f6d86ae37c1d2251ee935f17c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acae4bf2a6bead9d904b70d0480fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/674c6027fe6ac3a582bced0c2cde8c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc020b0997a2f37b214718112b79d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a719e840660f5c08ec081ee661d7ac77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e9af5ad8e107db8512bc54e627d565d.png)
(1)对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585be45e95d45f86456790525ef6e24d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/136c6a4d3de85560224cc18a46c60231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a4e2f595418c82b94ef66a6f526e63d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/636289ad84b4a3a51095dd32ca201f94.png)
(2)设集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169ccf0e6e7ada48126feac1e67de0c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5609d6ec9ef33f11e359f35d27289623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(i)对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2836fa0f9aca03548ec72d1bd49d9ff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07005ca97e96fafcef55ec126ba84f12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0603e63b4cc9944c237e4a776f0688b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e52c39d6ffd048bfa7bc97d849029ea.png)
(ii)对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2836fa0f9aca03548ec72d1bd49d9ff0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07005ca97e96fafcef55ec126ba84f12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0603e63b4cc9944c237e4a776f0688b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e52c39d6ffd048bfa7bc97d849029ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b1a5427d8ff23df0f3ec194756c84c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/686c919499ba2092f18a1555c5e1bce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a886d45a46bdde67115c5911cb85ea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5f2e87a902efe698955b1b7d805690b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735dd0765a19f97a03c9db4babb64ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d249478e181957c41657b2c61c1ad50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/916a915b809c8d0028cbe245e0149e83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47f5817ab7b88e9d8a83dd086ffdb3c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3909505a98004589b98f9d14e1bd41d.png)
您最近一年使用:0次
解题方法
5 . 已知定义域为
的函数
,其中
代表不超过
的最大整数.设数列
满足:
是
在
上最大值,数列
满足:
且
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ed2f490aac02631c2ed9e6b76354a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38618cc6b1ffc6c8a84c906260337b3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4737369d70b1a3144eedcb0c924df616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b5cc159f3dfa0534358359ea245338b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb8851954f243423781831867aedbdf.png)
A.![]() ![]() |
B.![]() ![]() ![]() |
C.![]() |
D.![]() |
您最近一年使用:0次
6 . 17世纪德国天文学家约翰内斯·开普勒提出描述行星运动的三大基本定律:
(a)行星绕太阳运动的轨道为椭圆(圆可视为特殊的椭圆),太阳位于椭圆的一个焦点上,所有行星的轨道可近似看成在同一平面内;
(b)行星在其椭圆轨道上的相等时间内,与太阳连线所扫过的面积相等.
(c)行星的公转周期的平方与它们的椭圆轨道长轴的立方成正比.
开普勒三定律为我们理解行星运动提供了重要的基础,并且被广泛应用于天体力学和行星轨道计算中.设a,b,
,地球、太阳、火星均可视为点,太阳位于
,地球的公转轨道可近似看成圆
,火星的公转轨道可近似看成圆
,且火星的公转周期约为地球公转周期的1.882倍.霍曼转移轨道E是以太阳所在位置为其中一个焦点,并且与
均相切的椭圆.2020年,我国自主研制的火星探测器天问一号从地球发射,经霍曼转移轨道到达火星,如下图所示.
(1)计算霍曼转移轨道E的离心率.(参考数据:
,计算结果保留两位小数)
(2)设天问一号位于E上的一点P,当P不在
上时,
上存在依赖于P的两点A,B,使得
为观测地球的最大视角(即地球不可能位于该角的外部),问:轨道平面内是否存在定圆
,使得直线AB恒与
相切?证明你的结论.
(a)行星绕太阳运动的轨道为椭圆(圆可视为特殊的椭圆),太阳位于椭圆的一个焦点上,所有行星的轨道可近似看成在同一平面内;
(b)行星在其椭圆轨道上的相等时间内,与太阳连线所扫过的面积相等.
(c)行星的公转周期的平方与它们的椭圆轨道长轴的立方成正比.
开普勒三定律为我们理解行星运动提供了重要的基础,并且被广泛应用于天体力学和行星轨道计算中.设a,b,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b644521da261e452421307913a47dacf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92476f5898293a343fe2c3895c12a249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d43cb1f811bcd47ae65285be9854a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea324a7d90c1c12472d2ab412c29e0e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aaa30d92dfea3fa999ffa88aaf89153.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/56c5d108-58bb-4d12-a973-26b3b768ae13.png?resizew=300)
(1)计算霍曼转移轨道E的离心率.(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08faef2ef9706bc0f8343a3b89462e25.png)
(2)设天问一号位于E上的一点P,当P不在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10392437ab60e58109787b9b0952f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f10392437ab60e58109787b9b0952f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2f4c73bee61643cfcd522cc70a3bca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2f4c73bee61643cfcd522cc70a3bca.png)
您最近一年使用:0次
解题方法
7 . 已知正七边形ABCDEFG的外接圆为
且A为该圆上距离坐标原点最远的点,则关于这七个点的回归直线方程为__________ ;设CG,AD交于Q,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9132d70f647b0578d00678883d8c66.png)
___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/175dd7ca22ea4f6a83530a746893624a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9132d70f647b0578d00678883d8c66.png)
您最近一年使用:0次
解题方法
8 . 数列
满足
且
,
,
,
构成等差数列.
(1)试求出所有三元实数组(α,β,γ),使得
为等比数列.
(2)若
,求
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f390f47fa5678c9a165c50fb9dec58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be536a2097ded867adac5edebb79906b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75e6820c50fa2aa589de5331d7d5f950.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13739ca823d61005798cc3298400c6b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad28237c0f9ca65341101d9d7e73e73e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee766a75ae9ee290e403b42b3569db6.png)
(1)试求出所有三元实数组(α,β,γ),使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee766a75ae9ee290e403b42b3569db6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4623bc660145c6ff98af7b1753d5357a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee766a75ae9ee290e403b42b3569db6.png)
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9 . 有n个进程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd432e2abf32a492b87a64728b2f57a5.png)
,
,···,
要访问一个数据库,不同进程之间、同一进程在不同时刻是否尝试访问数据库是相互独立的,且每一秒每个进程尝试访问数据库的概率均为
.若某一秒恰有一个进程访问数据库,则访问成功,否则访问失败.以下是一个
的样例:
记
为
在前t秒成功访问数据库的次数,
为自然对数的底,[x]表示不小于实数x的最小整数,下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd432e2abf32a492b87a64728b2f57a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b189a68f49f2f2523bdace15ea697b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b598b17985f56a065a175ffbbed9325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9d6b5d9ac4b06959e2ff16e4d4902a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44af93bcccbb92a89f131a753e4cde86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a50b36a56f772e8d14c8fbc32f098300.png)
序号/时刻 | 第1秒 | 第2秒 | 第3秒 | 第4秒 | 第5秒 | 第6秒 | 第7秒 | |
![]() | ✔ | ✔ | ✔ | |||||
![]() | ✔ | ✔ | ✔ | |||||
![]() | ✔ | ✔ | ||||||
![]() | ✔ | |||||||
访问结果 | ![]() | ![]() | 失败 | ![]() | 失败 | 失败 | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccb44fae126ae89eb8a47c8c2da15c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69cd3b917458d402b81411600d46cea5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
A.若n=4,则![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
10 . 记
为虚数单位,
为正整数,若
位于复平面的第四象限,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7035cd4adda5d72a9fc9f9fda75995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/207cc58375e2a75b45760f7dc84043a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次