【单选题】【消耗次数：1】
煤尘挥发分越高，感应期( )
①
A.越长
②
B.越短
③
C.不变
④
D.变多
参考答案：
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相关题目
【单选题】
盲人犯罪后可以（ ）。 A.不负刑事责任 B. 从轻、减轻或者免除处罚 C.从轻或者减轻处罚 D. 减轻处罚
①
A.不负刑事责任
②
B. 从轻、减轻或者免除处罚
③
C.从轻或者减轻处罚
④
D. 减轻处罚
随机题目
【单选题】
二次型<imgwidth="246"height="28"v:shapes="_x0000_i1258"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image271.png">标准型为（）
①
<imgwidth="126"height="46"v:shapes="_x0000_i1259"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image273.png">
②
<imgwidth="126"height="46"v:shapes="_x0000_i1260"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image275.png">
③
<imgwidth="122"height="28"v:shapes="_x0000_i1261"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image277.png">
④
<imgwidth="130"height="46"v:shapes="_x0000_i1262"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image279.png">
【单选题】
设<imgwidth="44"height="46"v:shapes="_x0000_i1079"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image054.png">是二阶矩阵<imgwidth="18"height="18"v:shapes="_x0000_i1080"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image004.png">的两个特征，那么它的特征方程是（）
①
<imgwidth="118"height="46"v:shapes="_x0000_i1081"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image056.png">
②
<imgwidth="122"height="24"v:shapes="_x0000_i1082"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image058.png">
③
<imgwidth="118"height="46"v:shapes="_x0000_i1083"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image060.png">
④
<imgwidth="122"height="24"v:shapes="_x0000_i1084"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image062.png">
【单选题】
若总体为正态分布，方差未知，检验<imgwidth="73"height="22"v:shapes="_x0000_i1436"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image583.png">，对<imgwidth="73"height="22"v:shapes="_x0000_i1437"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image585.png">抽取样本<imgwidth="78"height="22"v:shapes="_x0000_i1438"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image587.png">,则拒绝域仅与（）有关
①
样本值，显著水平
②
样本值，显著水平，样本容量<imgwidth="12"height="12"v:shapes="_x0000_i1439"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image589.png">
③
样本值，样本容量<imgwidth="12"height="12"v:shapes="_x0000_i1440"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image589.png">
④
显著水平，样本容量<imgwidth="12"height="12"v:shapes="_x0000_i1441"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image589.png">
【单选题】
C至少有1个发生的概率为（）
①
<imgwidth="15"height="41"v:shapes="_x0000_i1054"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image060.png">
②
<imgwidth="15"height="41"v:shapes="_x0000_i1055"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image062.png">
③
<imgwidth="16"height="41"v:shapes="_x0000_i1056"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image064.png">
④
<imgwidth="15"height="41"v:shapes="_x0000_i1057"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image066.png">
【单选题】
设<imgwidth="16"height="17"v:shapes="_x0000_i1188"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image265.png">与<imgwidth="16"height="17"v:shapes="_x0000_i1189"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image267.png">为两个随机事件，且有<imgwidth="88"height="21"v:shapes="_x0000_i1190"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image271.png">，则下列结论中正确的是（）
①
<imgwidth="152"height="21"v:shapes="_x0000_i1191"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image273.png">
②
<imgwidth="152"height="21"v:shapes="_x0000_i1192"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image275.png">
③
<imgwidth="90"height="21"v:shapes="_x0000_i1193"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image277.png">
④
<imgwidth="112"height="21"v:shapes="_x0000_i1194"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image279.png">
【单选题】
设随机变量<imgwidth="19"height="17"v:shapes="_x0000_i1242"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image266.png">的分布函数为<imgwidth="132"height="75"v:shapes="_x0000_i1243"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image335.png">，则<imgwidth="48"height="21"v:shapes="_x0000_i1244"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image337.png">（）
①
<imgwidth="57"height="35"v:shapes="_x0000_i1245"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image339.png">
②
<imgwidth="55"height="35"v:shapes="_x0000_i1246"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image341.png">
③
<imgwidth="108"height="35"v:shapes="_x0000_i1247"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image343.png">
④
<imgwidth="64"height="34"v:shapes="_x0000_i1248"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image345.png">
【单选题】
设<imgwidth="95"height="22"v:shapes="_x0000_i1198"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image265.png">与<imgwidth="78"height="22"v:shapes="_x0000_i1199"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image267.png">都是来自于总体<imgwidth="14"height="14"v:shapes="_x0000_i1200"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image154.png">的两独立样本，<imgwidth="14"height="20"v:shapes="_x0000_i1201"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image268.png">，<imgwidth="12"height="20"v:shapes="_x0000_i1202"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image247.png">与<imgwidth="46"height="22"v:shapes="_x0000_i1203"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image270.png">分别是两样本的均值和方差，<imgwidth="144"height="22"v:shapes="_x0000_i1204"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image272.png">，则有（）
①
对于任意的常数<imgwidth="179"height="22"v:shapes="_x0000_i1205"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image274.png">是<imgwidth="12"height="18"v:shapes="_x0000_i1206"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image276.png">的无偏估计，且<imgwidth="73"height="42"v:shapes="_x0000_i1207"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image278.png">，<imgwidth="73"height="42"v:shapes="_x0000_i1208"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image280.png">，<imgwidth="32"height="20"v:shapes="_x0000_i1209"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image282.png">达到最小
②
对于任意的常数<imgwidth="179"height="22"v:shapes="_x0000_i1210"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image274.png">是<imgwidth="12"height="18"v:shapes="_x0000_i1211"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image276.png">的无偏估计，且<imgwidth="73"height="42"v:shapes="_x0000_i1212"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image278.png">，<imgwidth="73"height="42"v:shapes="_x0000_i1213"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image280.png">，<imgwidth="32"height="20"v:shapes="_x0000_i1214"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image282.png">达到最小
③
对于任意常数<imgwidth="95"height="29"v:shapes="_x0000_i1215"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image284.png">，<imgwidth="202"height="26"v:shapes="_x0000_i1216"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image286.png">都是<imgwidth="12"height="18"v:shapes="_x0000_i1217"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image276.png">的无偏估计，并且当<imgwidth="46"height="40"v:shapes="_x0000_i1218"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image288.png">时，<imgwidth="35"height="20"v:shapes="_x0000_i1219"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image290.png">达到最小
④
对于任意常数<imgwidth="84"height="26"v:shapes="_x0000_i1220"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image291.png">，<imgwidth="207"height="26"v:shapes="_x0000_i1221"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image292.png">都是<imgwidth="12"height="18"v:shapes="_x0000_i1222"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image276.png">的无偏估计
【单选题】
已知<imgwidth="34"height="22"v:shapes="_x0000_i1231"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image291.png">均为<imgwidth="14"height="16"v:shapes="_x0000_i1232"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image293.png">阶方阵且<imgwidth="18"height="18"v:shapes="_x0000_i1233"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image285.png">与<imgwidth="18"height="18"v:shapes="_x0000_i1234"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image295.png">相似，若<imgwidth="56"height="22"v:shapes="_x0000_i1235"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image297.png">，则<imgwidth="24"height="22"v:shapes="_x0000_i1236"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image299.png">为（）
①
<imgwidth="24"height="22"v:shapes="_x0000_i1237"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image301.png">
②
<imgwidth="18"height="18"v:shapes="_x0000_i1238"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image285.png">
③
<imgwidth="18"height="18"v:shapes="_x0000_i1239"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image303.png">
④
<imgwidth="54"height="22"v:shapes="_x0000_i1240"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image305.png">
【单选题】
二次型<imgwidth="230"height="28"v:shapes="_x0000_i1248"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image251.png">的秩为（）
①
<imgwidth="38"height="18"v:shapes="_x0000_i1249"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image253.png">
②
<imgwidth="42"height="18"v:shapes="_x0000_i1250"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image255.png">
③
<imgwidth="40"height="20"v:shapes="_x0000_i1251"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image257.png">
④
都不对
【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