【单选题】【消耗次数：1】
固定管板式换热器的主要部件组成不包括（ ）。
①
管板
②
膨胀节
③
降液管
④
管箱
参考答案：
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随机题目
【单选题】
设<imgwidth="35"height="21"v:shapes="_x0000_i1063"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image070.png">为随机变量，且<imgwidth="223"height="21"v:shapes="_x0000_i1064"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image072.png">则<imgwidth="84"height="21"v:shapes="_x0000_i1065"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb09.files/image046.png">（）
①
1
②
2
③
3
④
4
【单选题】
设总体<imgwidth="14"height="14"v:shapes="_x0000_i1259"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image333.png">的分布中带有未知参数<imgwidth="12"height="14"v:shapes="_x0000_i1260"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image334.png">，<imgwidth="86"height="22"v:shapes="_x0000_i1261"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image336.png">为样本，<imgwidth="29"height="26"v:shapes="_x0000_i1262"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image338.png"><imgwidth="109"height="26"v:shapes="_x0000_i1263"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image340.png">和<imgwidth="146"height="26"v:shapes="_x0000_i1264"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image342.png">是参数<imgwidth="12"height="20"v:shapes="_x0000_i1265"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image343.png">的两个无偏估计，若对任意的样本容量<imgwidth="12"height="14"v:shapes="_x0000_i1266"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image345.png">，若<imgwidth="12"height="26"v:shapes="_x0000_i1267"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image346.png">为比<imgwidth="12"height="26"v:shapes="_x0000_i1268"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image347.png">有效的估计量，则必有（）
①
<imgwidth="95"height="26"v:shapes="_x0000_i1269"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image348.png">
②
<imgwidth="95"height="26"v:shapes="_x0000_i1270"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image350.png">
③
<imgwidth="86"height="26"v:shapes="_x0000_i1271"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image352.png">
④
<imgwidth="86"height="26"v:shapes="_x0000_i1272"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image354.png">
【单选题】
<imgwidth="19"height="17"v:shapes="_x0000_i1194"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image262.png">为连续型随机变量，<imgwidth="36"height="21"v:shapes="_x0000_i1195"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image288.png">为其概率密度函数，则（）
①
<imgwidth="83"height="21"v:shapes="_x0000_i1196"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image290.png">
②
<imgwidth="56"height="21"v:shapes="_x0000_i1197"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image292.png">
③
<imgwidth="112"height="21"v:shapes="_x0000_i1198"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image294.png">
④
<imgwidth="59"height="21"v:shapes="_x0000_i1199"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image296.png">
【单选题】
设<imgwidth="112"height="21"v:shapes="_x0000_i1027"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image004.png">，即<imgwidth="13"height="15"v:shapes="_x0000_i1028"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image006.png">服从参数为<imgwidth="15"height="19"v:shapes="_x0000_i1029"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image008.png">的泊松分布，则<imgwidth="51"height="44"v:shapes="_x0000_i1030"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image010.png">（）
①
1
②
<imgwidth="15"height="18"v:shapes="_x0000_i1031"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb10.files/image012.png">
③
2
④
4
【单选题】
若<imgwidth="70"height="26"v:shapes="_x0000_i1276"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image279.png">为齐次线性方程组且<imgwidth="54"height="20"v:shapes="_x0000_i1277"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image297.png">的一个基础解系则（）
①
<imgwidth="174"height="26"v:shapes="_x0000_i1278"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image349.png">也是它的一个基础解系
②
基础解系具有唯一性
③
<imgwidth="174"height="26"v:shapes="_x0000_i1279"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image349.png">不一定是<imgwidth="54"height="20"v:shapes="_x0000_i1280"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image297.png">的基础解系
④
以上答案都不对
【单选题】
设函数<imgwidth="46"height="26"v:shapes="_x0000_i1097"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image090.png">，方程组<imgwidth="166"height="58"v:shapes="_x0000_i1098"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image092.png">的基础解系中含有1个向量，则必有（）
①
<imgwidth="122"height="58"v:shapes="_x0000_i1099"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image094.png">
②
<imgwidth="98"height="52"v:shapes="_x0000_i1100"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image096.png">
③
<imgwidth="86"height="26"v:shapes="_x0000_i1101"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image098.png">
④
<imgwidth="58"height="26"v:shapes="_x0000_i1102"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image100.png">与<imgwidth="62"height="26"v:shapes="_x0000_i1103"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image102.png">不成比例
【单选题】
<imgwidth="505"height="29"v:shapes="图片_x0020_84"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image091.png">
①
<imgwidth="52"height="30"v:shapes="图片_x0020_85"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image092.png">
②
<imgwidth="67"height="34"v:shapes="图片_x0020_86"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image093.png">
③
<imgwidth="132"height="30"v:shapes="图片_x0020_87"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image094.png">
④
<imgwidth="56"height="31"v:shapes="图片_x0020_88"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image095.png">
【单选题】
<imgwidth="577"height="30"v:shapes="图片_x0020_99"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds02.files/image106.png">
①
全不非负
②
不全为零
③
全不为零
④
全大于零
【单选题】
独立方程<imgwidth="150"height="58"v:shapes="_x0000_i1118"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image114.png">则基础解系为（）
①
<imgwidth="68"height="154"v:shapes="_x0000_i1119"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image116.png">
②
<imgwidth="82"height="154"v:shapes="_x0000_i1120"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image118.png">
③
<imgwidth="82"height="154"v:shapes="_x0000_i1121"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image120.png">
④
<imgwidth="68"height="154"v:shapes="_x0000_i1122"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image122.png">
【单选题】
<imgwidth="409"height="37"v:shapes="图片_x0020_36"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image035.png">
①
<imgwidth="42"height="33"v:shapes="图片_x0020_37"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image036.png">
②
<imgwidth="49"height="43"v:shapes="图片_x0020_38"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image037.png">
③
<imgwidth="51"height="32"v:shapes="图片_x0020_39"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image038.png">
④
<imgwidth="81"height="38"v:shapes="图片_x0020_40"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image039.png">