【判断题】【消耗次数：1】
水平梁在竖向外力作用下，横截面上的内力只有切力。 （）
①
正确
②
错误
参考答案：
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相关题目
随机题目
【单选题】
设4个3维列向量<imgwidth="94"height="26"v:shapes="_x0000_i1127"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image146.png">组成的矩阵经初等行变换后变为<imgwidth="266"height="84"v:shapes="_x0000_i1128"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image148.png">，则<imgwidth="22"height="26"v:shapes="_x0000_i1129"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image150.png">可表示为<imgwidth="38"height="26"v:shapes="_x0000_i1130"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image152.png">（）
①
<imgwidth="92"height="26"v:shapes="_x0000_i1131"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image154.png">
②
<imgwidth="120"height="26"v:shapes="_x0000_i1132"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image156.png">
③
<imgwidth="110"height="26"v:shapes="_x0000_i1133"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image158.png">
④
<imgwidth="56"height="26"v:shapes="_x0000_i1134"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image160.png">
【单选题】
设X是一随机变量，<imgwidth="17"height="25"v:shapes="_x0000_i1298"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image471.png">为任意实数，<imgwidth="41"height="21"v:shapes="_x0000_i1299"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image473.png">是<imgwidth="19"height="17"v:shapes="_x0000_i1300"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image316.png">的数学期望，则（）
①
<imgwidth="184"height="26"v:shapes="_x0000_i1301"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image476.png">
②
<imgwidth="183"height="26"v:shapes="_x0000_i1302"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image478.png">
③
<imgwidth="183"height="26"v:shapes="_x0000_i1303"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image480.png">
④
<imgwidth="100"height="26"v:shapes="_x0000_i1304"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image482.png">
【单选题】
<imgwidth="369"height="139"v:shapes="图片_x0020_122"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image120.png">
①
0
②
<imgwidth="159"height="36"v:shapes="图片_x0020_123"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image121.png">
③
<imgwidth="112"height="34"v:shapes="图片_x0020_124"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image122.png">
④
<imgwidth="138"height="33"v:shapes="图片_x0020_125"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image123.png">
【单选题】
对于齐次线性方程组以下说法正确的是（）
①
若<imgwidth="54"height="20"v:shapes="_x0000_i1352"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image297.png">有解，则必有<imgwidth="54"height="22"v:shapes="_x0000_i1353"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image439.png">
②
若<imgwidth="54"height="20"v:shapes="_x0000_i1354"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image297.png">无解，则必有<imgwidth="54"height="22"v:shapes="_x0000_i1355"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image441.png">
③
若<imgwidth="54"height="20"v:shapes="_x0000_i1356"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image297.png">有非零解，则必有<imgwidth="54"height="22"v:shapes="_x0000_i1357"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image439.png">
④
<imgwidth="54"height="20"v:shapes="_x0000_i1358"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image297.png">总有解
【单选题】
<imgwidth="14"height="14"v:shapes="_x0000_i1208"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image301.png">张奖券中含有<imgwidth="17"height="15"v:shapes="_x0000_i1209"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image303.png">张有奖的，今有<imgwidth="13"height="19"v:shapes="_x0000_i1210"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image305.png">个人每人购买1张，则其中至少有1个人中奖的概率为（）
①
<imgwidth="26"height="46"v:shapes="_x0000_i1211"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image307.png">
②
<imgwidth="56"height="48"v:shapes="_x0000_i1212"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image309.png">
③
<imgwidth="55"height="48"v:shapes="_x0000_i1213"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image311.png">
④
<imgwidth="46"height="48"v:shapes="_x0000_i1214"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image313.png">
【单选题】
二次型矩阵<imgwidth="110"height="114"v:shapes="_x0000_i1347"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image430.png">的正惯性指数为（
①
<imgwidth="14"height="20"v:shapes="_x0000_i1348"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image428.png">
②
<imgwidth="10"height="18"v:shapes="_x0000_i1349"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image323.png">
③
<imgwidth="14"height="18"v:shapes="_x0000_i1350"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image426.png">
④
<imgwidth="14"height="18"v:shapes="_x0000_i1351"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image433.png">
【单选题】
<imgwidth="558"height="121"v:shapes="图片_x0020_19"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image019.png">
①
<imgwidth="88"height="91"v:shapes="图片_x0020_20"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image020.png">
②
<imgwidth="90"height="89"v:shapes="图片_x0020_21"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image021.png">
③
<imgwidth="85"height="86"v:shapes="图片_x0020_22"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image022.png">
④
<imgwidth="93"height="84"v:shapes="图片_x0020_23"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image023.png">
【单选题】
向量组<imgwidth="124"height="28"v:shapes="_x0000_i1096"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image122.png">和向量组<imgwidth="132"height="28"v:shapes="_x0000_i1097"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image124.png">等价的定义是向量组（）
①
<imgwidth="26"height="28"v:shapes="_x0000_i1098"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image126.png">和<imgwidth="34"height="28"v:shapes="_x0000_i1099"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image128.png">可互相线性表出
②
<imgwidth="26"height="28"v:shapes="_x0000_i1100"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image126.png">和<imgwidth="34"height="28"v:shapes="_x0000_i1101"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image128.png">中有一组可由另一组线性表出
③
<imgwidth="26"height="28"v:shapes="_x0000_i1102"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image126.png">和<imgwidth="34"height="28"v:shapes="_x0000_i1103"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image128.png">中所含向量的个数相等
④
<imgwidth="26"height="28"v:shapes="_x0000_i1104"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image126.png">和<imgwidth="34"height="28"v:shapes="_x0000_i1105"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image128.png">的秩相等
【单选题】
<imgwidth="574"height="32"v:shapes="图片_x0020_94"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image101.png">
①
<imgwidth="35"height="35"v:shapes="图片_x0020_95"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image102.png">
②
<imgwidth="35"height="48"v:shapes="图片_x0020_96"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image103.png">
③
<imgwidth="47"height="31"v:shapes="图片_x0020_97"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image104.png">
④
<imgwidth="49"height="34"v:shapes="图片_x0020_98"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image105.png">
【单选题】
设随机变量<imgwidth="19"height="17"v:shapes="_x0000_i1025"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image002.png">的期望和方差相等，则<imgwidth="19"height="17"v:shapes="_x0000_i1026"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image002.png">不能服从（）
①
正态分布
②
指数分布
③
泊松分布
④
二项分布