【单选题】【消耗次数：1】
移植物韧带化过程中强度最危险区指的是
①
术后1-6周
②
术后6-12周
③
术后2-4周
④
术后12-20周
⑤
术后20-24周
参考答案：
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相关题目
随机题目
【单选题】
设<imgwidth="18"height="18"v:shapes="_x0000_i1106"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image130.png">是<imgwidth="44"height="16"v:shapes="_x0000_i1107"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image132.png">矩阵，则齐次线性方程<imgwidth="54"height="20"v:shapes="_x0000_i1108"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image134.png">仅有零解的充分必要条件是（）
①
<imgwidth="18"height="18"v:shapes="_x0000_i1109"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image130.png">的行向量组线性无关
②
<imgwidth="18"height="18"v:shapes="_x0000_i1110"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image130.png">的行向量组线性相关
③
<imgwidth="18"height="18"v:shapes="_x0000_i1111"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image130.png">的列向量组线性无关
④
<imgwidth="18"height="18"v:shapes="_x0000_i1112"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image130.png">的列向量组线性相关
【单选题】
设随机变量X的期望<imgwidth="41"height="21"v:shapes="_x0000_i1042"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image028.png">和方差<imgwidth="42"height="21"v:shapes="_x0000_i1043"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image030.png">都存在，则对任意正数<imgwidth="13"height="15"v:shapes="_x0000_i1044"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image032.png">，有（）
①
<imgwidth="180"height="41"v:shapes="_x0000_i1045"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image034.png">
②
<imgwidth="180"height="41"v:shapes="_x0000_i1046"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image036.png">
③
<imgwidth="180"height="41"v:shapes="_x0000_i1047"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image038.png">
④
<imgwidth="180"height="41"v:shapes="_x0000_i1048"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image040.png">
【单选题】
称<imgwidth="86"height="22"v:shapes="_x0000_i1305"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image377.png">是来自总体<imgwidth="14"height="12"v:shapes="_x0000_i1306"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image341.png">的一个简单随机样本（简称样本），即<imgwidth="86"height="22"v:shapes="_x0000_i1307"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image377.png">满足（）
①
<imgwidth="86"height="22"v:shapes="_x0000_i1308"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image377.png">相互独立，不一定同分布
②
<imgwidth="86"height="22"v:shapes="_x0000_i1309"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image377.png">相互独立同分布，但与总体分布不一定相同
③
<imgwidth="86"height="22"v:shapes="_x0000_i1310"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image377.png">相互独立且均与总体同分布
④
<imgwidth="86"height="22"v:shapes="_x0000_i1311"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image377.png">与总体同分布，但不一定相互独立
【单选题】
设<imgwidth="51"height="25"v:shapes="_x0000_i1039"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image020.png">为相互独立的随机变量，且<imgwidth="183"height="26"v:shapes="_x0000_i1040"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image024.png">，则<imgwidth="146"height="25"v:shapes="_x0000_i1041"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image026.png">分别为（）
①
5，7
②
5，25
③
5，5
④
6，5
【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">