【判断题】【消耗次数：1】
负温度系数热敏电阻传感器的电阻值与温度大小成反比
①
正确
②
错误
参考答案：
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相关题目
【简答题】
冷却液温度传感器是一个[填空]温度系数的热敏电阻
随机题目
【单选题】
<imgwidth="335"height="33"v:shapes="图片_x0020_168"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image166.png">
①
对称矩阵
②
非对称矩阵
③
反对称矩阵
④
不一定是对称矩阵
【单选题】
设随机变量<imgwidth="13"height="15"v:shapes="_x0000_i1216"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image328.png">和<imgwidth="13"height="17"v:shapes="_x0000_i1217"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image330.png">的密度函数分别为<imgwidth="131"height="48"v:shapes="_x0000_i1218"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image332.png"><imgwidth="140"height="50"v:shapes="_x0000_i1219"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image334.png">若<imgwidth="13"height="15"v:shapes="_x0000_i1220"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image328.png">与<imgwidth="13"height="17"v:shapes="_x0000_i1221"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image330.png">相互独立，则<imgwidth="57"height="21"v:shapes="_x0000_i1222"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image336.png">（）
①
1
②
<imgwidth="16"height="41"v:shapes="_x0000_i1223"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image338.png">
③
<imgwidth="15"height="41"v:shapes="_x0000_i1224"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image340.png">
④
<imgwidth="16"height="41"v:shapes="_x0000_i1225"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image342.png">
【单选题】
<imgwidth="580"height="33"v:shapes="图片_x0020_184"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image190.png">
①
<imgwidth="55"height="28"v:shapes="图片_x0020_185"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image191.png">
②
<imgwidth="61"height="30"v:shapes="图片_x0020_186"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image192.png">
③
<imgwidth="67"height="26"v:shapes="图片_x0020_187"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image193.png">
④
<imgwidth="52"height="28"v:shapes="图片_x0020_188"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image194.png">
【单选题】
设随机事件A与B相互独立，A发生B不发生的概率与B发生A不发生的概率相等，且<imgwidth="63"height="41"v:shapes="_x0000_i1060"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image072.png">，则<imgwidth="60"height="21"v:shapes="_x0000_i1061"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image074.png">（）
①
0.5
②
<imgwidth="15"height="41"v:shapes="_x0000_i1062"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image076.png">
③
<imgwidth="16"height="41"v:shapes="_x0000_i1063"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image078.png">
④
<imgwidth="16"height="41"v:shapes="_x0000_i1064"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image080.png">
【单选题】
设连续型随机变量<imgwidth="19"height="17"v:shapes="_x0000_i1182"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image266.png">的密度函数为<imgwidth="36"height="21"v:shapes="_x0000_i1183"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image268.png">，则当（）时，<imgwidth="80"height="35"v:shapes="_x0000_i1184"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image270.png">为随机变量<imgwidth="19"height="17"v:shapes="_x0000_i1185"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image266.png">数学期望.
①
<imgwidth="80"height="35"v:shapes="_x0000_i1186"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image270.png">收敛
②
<imgwidth="36"height="21"v:shapes="_x0000_i1187"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image268.png">为有界函数
③
<imgwidth="88"height="29"v:shapes="_x0000_i1188"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image274.png">
④
<imgwidth="80"height="35"v:shapes="_x0000_i1189"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image270.png">绝对收敛
【单选题】
设某钢珠直径<imgwidth="14"height="14"v:shapes="_x0000_i1251"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image322.png">服从正态分布<imgwidth="49"height="18"v:shapes="_x0000_i1252"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image324.png">，（单位：mm），其中<imgwidth="12"height="18"v:shapes="_x0000_i1253"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image276.png">为未知参数，从刚生产出的一大堆钢珠中随机抽出9个，求得样本均值<imgwidth="122"height="49"v:shapes="_x0000_i1254"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image326.png">，样本方差<imgwidth="170"height="40"v:shapes="_x0000_i1255"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image328.png">。则<imgwidth="12"height="18"v:shapes="_x0000_i1256"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image276.png">的极大似然估计值为（）
①
31.06
②
<imgwidth="176"height="20"v:shapes="_x0000_i1257"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image330.png">
③
0.98
④
<imgwidth="58"height="20"v:shapes="_x0000_i1258"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image332.png">
【单选题】
设三阶方阵<imgwidth="18"height="18"v:shapes="_x0000_i1085"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的特征值为<imgwidth="52"height="22"v:shapes="_x0000_i1086"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image064.png">，对应的特征向量为<imgwidth="70"height="26"v:shapes="_x0000_i1087"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image066.png">，若<imgwidth="32"height="18"v:shapes="_x0000_i1088"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image068.png"><imgwidth="84"height="26"v:shapes="_x0000_i1089"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image070.png">，则<imgwidth="68"height="22"v:shapes="_x0000_i1090"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image072.png">
①
<imgwidth="82"height="84"v:shapes="_x0000_i1091"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image074.png">
②
<imgwidth="82"height="84"v:shapes="_x0000_i1092"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image076.png">
③
<imgwidth="94"height="84"v:shapes="_x0000_i1093"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image078.png">
④
<imgwidth="94"height="84"v:shapes="_x0000_i1094"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image080.png">
【单选题】
二次型<imgwidth="324"height="28"v:shapes="_x0000_i1337"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image412.png">标准型为（）
①
<imgwidth="92"height="28"v:shapes="_x0000_i1338"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image414.png">
②
<imgwidth="92"height="28"v:shapes="_x0000_i1339"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image416.png">
③
<imgwidth="104"height="28"v:shapes="_x0000_i1340"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image418.png">
④
<imgwidth="92"height="28"v:shapes="_x0000_i1341"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image420.png">
【单选题】
下列矩阵中，不是二次型矩阵的是（）
①
<imgwidth="94"height="84"v:shapes="_x0000_i1192"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image213.png">
②
<imgwidth="94"height="84"v:shapes="_x0000_i1193"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image215.png">
③
<imgwidth="106"height="84"v:shapes="_x0000_i1194"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image217.png">
④
<imgwidth="86"height="84"v:shapes="_x0000_i1195"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image219.png">