【单选题】【消耗次数：1】
启事的含义有三种:一是陈述事情,多用于下对上;二是陈述事情的奏章、函件;三是（ ）。
①
说服受众采取购买商品
②
公开陈述某事的文字
③
报道影讯、展览、演出、体育及其他比赛、报告会、讲座等信息
参考答案：
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相关题目
随机题目
【单选题】
二次型<imgwidth="210"height="28"v:shapes="_x0000_i1315"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image375.png">的规范形是（）
①
<imgwidth="68"height="28"v:shapes="_x0000_i1316"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image377.png">
②
<imgwidth="22"height="28"v:shapes="_x0000_i1317"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image379.png">
③
<imgwidth="58"height="28"v:shapes="_x0000_i1318"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image381.png">
④
<imgwidth="58"height="28"v:shapes="_x0000_i1319"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image383.png">
【单选题】
设总体<imgwidth="14"height="14"v:shapes="_x0000_i1273"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image333.png">服从泊松分布：<imgwidth="217"height="40"v:shapes="_x0000_i1274"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image356.png">，其中<imgwidth="32"height="18"v:shapes="_x0000_i1275"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image358.png">为未知参数，<imgwidth="86"height="22"v:shapes="_x0000_i1276"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image336.png">为样本，记<imgwidth="84"height="40"v:shapes="_x0000_i1277"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image360.png">，则下面几种说法错误的是（）
①
<imgwidth="14"height="18"v:shapes="_x0000_i1278"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image362.png">是<imgwidth="12"height="18"v:shapes="_x0000_i1279"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image364.png">的无偏估计
②
<imgwidth="14"height="18"v:shapes="_x0000_i1280"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image362.png">是<imgwidth="12"height="18"v:shapes="_x0000_i1281"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image364.png">的矩估计
③
<imgwidth="14"height="14"v:shapes="_x0000_i1282"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image365.png">是<imgwidth="35"height="20"v:shapes="_x0000_i1283"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image367.png">的矩估计
④
<imgwidth="14"height="20"v:shapes="_x0000_i1284"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image368.png">是<imgwidth="12"height="37"v:shapes="_x0000_i1285"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image370.png">的矩估计
【单选题】
已知<imgwidth="138"height="26"v:shapes="_x0000_i1327"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image398.png">，则<imgwidth="70"height="24"v:shapes="_x0000_i1328"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image400.png">为（）
①
<imgwidth="96"height="26"v:shapes="_x0000_i1329"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image402.png">
②
<imgwidth="98"height="26"v:shapes="_x0000_i1330"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image404.png">
③
<imgwidth="126"height="26"v:shapes="_x0000_i1331"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image406.png">
④
<imgwidth="166"height="28"v:shapes="_x0000_i1332"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image408.png">
【单选题】
总体均值<imgwidth="12"height="20"v:shapes="_x0000_i1240"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image307.png">的区间估计中，下面说法中，正确的是（）
①
置信度<imgwidth="35"height="14"v:shapes="_x0000_i1241"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image309.png">一定时，样本容量增加，则置信区间的长度变长
②
置信度<imgwidth="35"height="14"v:shapes="_x0000_i1242"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image309.png">一定时，样本容量增加，则置信区间的长度变短
③
置信度<imgwidth="35"height="14"v:shapes="_x0000_i1243"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image309.png">变小，则置信区间的长度变短
④
置信度<imgwidth="35"height="14"v:shapes="_x0000_i1244"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image309.png">变大，则置信区间的长度变短
【单选题】
从一批产品中随机抽两次，每次抽1件。以A表示事件“两次都抽得正品”，B表示事件“至少抽得一件次品”，则下列关系式中，正确的是（）
①
<imgwidth="46"height="17"v:shapes="_x0000_i1077"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image102.png">
②
<imgwidth="46"height="17"v:shapes="_x0000_i1078"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image104.png">
③
<imgwidth="42"height="17"v:shapes="_x0000_i1079"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image106.png">
④
<imgwidth="42"height="20"v:shapes="_x0000_i1080"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image108.png">
【单选题】
<imgwidth="440"height="36"v:shapes="图片_x0020_179"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image185.png">
①
<imgwidth="449"height="27"v:shapes="图片_x0020_180"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image186.png">
②
<imgwidth="284"height="27"v:shapes="图片_x0020_181"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image187.png">
③
<imgwidth="278"height="23"v:shapes="图片_x0020_182"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image188.png">
④
以上都不对
【单选题】
设<imgwidth="18"height="18"v:shapes="_x0000_i1095"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">是一个<imgwidth="14"height="16"v:shapes="_x0000_i1096"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image002.png">阶<imgwidth="40"height="20"v:shapes="_x0000_i1097"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image082.png">阶方阵，下列陈述中正确的是（）
①
如存在数<imgwidth="16"height="20"v:shapes="_x0000_i1098"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image010.png">和向量<imgwidth="18"height="16"v:shapes="_x0000_i1099"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image084.png">使<imgwidth="72"height="20"v:shapes="_x0000_i1100"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image086.png">，则<imgwidth="18"height="16"v:shapes="_x0000_i1101"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image084.png">是<imgwidth="18"height="18"v:shapes="_x0000_i1102"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的属于特征值<imgwidth="16"height="20"v:shapes="_x0000_i1103"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image010.png">的特征向量
②
如存在数<imgwidth="16"height="20"v:shapes="_x0000_i1104"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image010.png">和非零向量<imgwidth="18"height="16"v:shapes="_x0000_i1105"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image084.png">，使<imgwidth="114"height="28"v:shapes="_x0000_i1106"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image088.png">，则<imgwidth="16"height="20"v:shapes="_x0000_i1107"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image010.png">是<imgwidth="18"height="18"v:shapes="_x0000_i1108"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的特征值
③
<imgwidth="18"height="18"v:shapes="_x0000_i1109"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的2个不同的特征值可以有同一个特征向量
④
<imgwidth="64"height="26"v:shapes="_x0000_i1110"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image090.png">是<imgwidth="18"height="18"v:shapes="_x0000_i1111"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的3个互不相同的特征值，<imgwidth="70"height="26"v:shapes="_x0000_i1112"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image066.png">依次是<imgwidth="18"height="18"v:shapes="_x0000_i1113"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的属于<imgwidth="64"height="26"v:shapes="_x0000_i1114"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image090.png">的特征向量，则<imgwidth="70"height="26"v:shapes="_x0000_i1115"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image066.png">有可能线性相关
【单选题】
设二维随机变量<imgwidth="46"height="21"v:shapes="_x0000_i1049"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image042.png"><imgwidth="79"height="41"v:shapes="_x0000_i1050"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image044.png">，则<imgwidth="84"height="21"v:shapes="_x0000_i1051"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image046.png">（）
①
<imgwidth="16"height="41"v:shapes="_x0000_i1052"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image048.png">
②
3
③
18
④
36
【单选题】
<imgwidth="367"height="47"v:shapes="图片_x0020_70"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image077.png">
①
-1
②
1
③
<imgwidth="24"height="20"v:shapes="图片_x0020_71"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image078.png">
④
<imgwidth="13"height="20"v:shapes="图片_x0020_72"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image079.png">
【单选题】
矩阵（）合同于<imgwidth="98"height="108"v:shapes="_x0000_i1278"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image304.png">
①
<imgwidth="94"height="84"v:shapes="_x0000_i1279"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image306.png">
②
<imgwidth="94"height="84"v:shapes="_x0000_i1280"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image308.png">
③
<imgwidth="110"height="84"v:shapes="_x0000_i1281"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image310.png">
④
<imgwidth="84"height="84"v:shapes="_x0000_i1282"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image312.png">