【单选题】【消耗次数：1】
甲基叔丁基醚的主要用途是用作( )。
①
丁腈橡胶
②
异戊橡胶
③
工程塑料
④
汽油高辛烷值添加剂
参考答案：
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相关题目
【多选题】
收入户的主要用途是：（ ）。
①
暂存由经办机构征收的社会保险费收入
②
暂存上级经办机构下拨或下级经办机构上解的基金收入
③
暂存该账户利息收入
④
暂存社会保险基金转移收入以及其他收入
【单选题】
超声造影的主要用途
①
提高超声对病灶的诊断和鉴别诊断能力
②
提高超声对病灶的检出能力
③
提高多普勒超声检测血流信号的能力
④
提高超声对病变治疗后的疗效判断能力
⑤
以上都是
【简答题】
键联接的主要用途是[填空1]
随机题目
【单选题】
设<imgwidth="90"height="25"v:shapes="_x0000_i1095"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image084.png">，则<imgwidth="73"height="44"v:shapes="_x0000_i1096"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image112.png">~（）
①
<imgwidth="64"height="25"v:shapes="_x0000_i1097"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image113.png">
②
<imgwidth="48"height="21"v:shapes="_x0000_i1098"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image114.png">
③
<imgwidth="80"height="41"v:shapes="_x0000_i1099"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image116.png">
④
<imgwidth="108"height="25"v:shapes="_x0000_i1100"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image117.png">
【单选题】
<imgwidth="437"height="30"v:shapes="图片_x0020_181"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image180.png">
①
<imgwidth="240"height="41"v:shapes="图片_x0020_182"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image181.png">
②
<imgwidth="240"height="55"v:shapes="图片_x0020_183"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image182.png">
③
<imgwidth="233"height="28"v:shapes="图片_x0020_184"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image183.png">
④
<imgwidth="153"height="46"v:shapes="图片_x0020_185"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds01.files/image184.png">
【单选题】
齐次线性方程组<imgwidth="190"height="84"v:shapes="_x0000_i1169"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image200.png">的自由未知量为（）
①
<imgwidth="40"height="26"v:shapes="_x0000_i1170"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image202.png">
②
<imgwidth="42"height="26"v:shapes="_x0000_i1171"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image204.png">
③
<imgwidth="42"height="26"v:shapes="_x0000_i1172"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image206.png">
④
<imgwidth="40"height="26"v:shapes="_x0000_i1173"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image208.png">
【单选题】
设函数<imgwidth="36"height="21"v:shapes="_x0000_i1221"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image288.png">在区间<imgwidth="36"height="21"v:shapes="_x0000_i1222"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image340.png">上等于<imgwidth="35"height="19"v:shapes="_x0000_i1223"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image342.png">,而在此区间外等于0;若<imgwidth="36"height="21"v:shapes="_x0000_i1224"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image288.png">可以作为某连续随机变量的概率密度函数,则区间<imgwidth="36"height="21"v:shapes="_x0000_i1225"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image340.png">为（）
①
<imgwidth="40"height="41"v:shapes="_x0000_i1226"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image344.png">
②
<imgwidth="37"height="21"v:shapes="_x0000_i1227"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image346.png">
③
<imgwidth="54"height="42"v:shapes="_x0000_i1228"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image348.png">
④
<imgwidth="48"height="42"v:shapes="_x0000_i1229"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb07.files/image350.png">
【单选题】
掷一枚骰子，设<imgwidth="247"height="22"v:shapes="_x0000_i1162"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image222.png">，则下列说法正确的是（）
①
<imgwidth="131"height="22"v:shapes="_x0000_i1163"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image224.png">
②
<imgwidth="108"height="25"v:shapes="_x0000_i1164"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image226.png">
③
<imgwidth="90"height="25"v:shapes="_x0000_i1165"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image228.png">
④
<imgwidth="73"height="17"v:shapes="_x0000_i1166"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb06.files/image230.png">
【单选题】
设<imgwidth="18"height="18"v:shapes="_x0000_i1034"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image008.png">为<imgwidth="14"height="16"v:shapes="_x0000_i1035"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image004.png">阶方阵，<imgwidth="18"height="18"v:shapes="_x0000_i1036"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image010.png">是<imgwidth="18"height="18"v:shapes="_x0000_i1037"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image008.png">经过若干次矩阵的初等变换后得到的矩阵，则有（）
①
<imgwidth="64"height="22"v:shapes="_x0000_i1038"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image012.png">
②
<imgwidth="66"height="22"v:shapes="_x0000_i1039"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image014.png">
③
若<imgwidth="54"height="22"v:shapes="_x0000_i1040"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image016.png">，则一定有<imgwidth="54"height="22"v:shapes="_x0000_i1041"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image018.png">
④
<imgwidth="54"height="22"v:shapes="_x0000_i1042"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image020.png">，则一定有<imgwidth="54"height="22"v:shapes="_x0000_i1043"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds04.files/image022.png">
【单选题】
若<imgwidth="18"height="18"v:shapes="_x0000_i1305"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image110.png">是<imgwidth="34"height="18"v:shapes="_x0000_i1306"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image380.png">矩阵，<imgwidth="54"height="20"v:shapes="_x0000_i1307"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image297.png">是<imgwidth="54"height="20"v:shapes="_x0000_i1308"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image331.png">的导出组，则（）
①
若<imgwidth="54"height="20"v:shapes="_x0000_i1309"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image331.png">有无穷多个解，则<imgwidth="54"height="20"v:shapes="_x0000_i1310"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image297.png">仅有零解
②
<imgwidth="54"height="20"v:shapes="_x0000_i1311"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image297.png">仅有零解，则<imgwidth="54"height="20"v:shapes="_x0000_i1312"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image331.png">有唯一解
③
若<imgwidth="54"height="20"v:shapes="_x0000_i1313"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image331.png">有无穷多个解，则<imgwidth="54"height="20"v:shapes="_x0000_i1314"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image297.png">有非零解
④
<imgwidth="54"height="20"v:shapes="_x0000_i1315"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image297.png">有非零解，则<imgwidth="54"height="20"v:shapes="_x0000_i1316"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image331.png">有无穷多个解
【单选题】
已知向量<imgwidth="288"height="114"v:shapes="_x0000_i1294"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image366.png">，若<imgwidth="18"height="22"v:shapes="_x0000_i1295"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image368.png">可由<imgwidth="70"height="26"v:shapes="_x0000_i1296"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image279.png">线性表出那么（）
①
<imgwidth="45"height="22"v:shapes="_x0000_i1297"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image371.png">，<imgwidth="49"height="22"v:shapes="_x0000_i1298"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image373.png">
②
<imgwidth="45"height="22"v:shapes="_x0000_i1299"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image371.png">，<imgwidth="49"height="22"v:shapes="_x0000_i1300"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image373.png">
③
<imgwidth="45"height="22"v:shapes="_x0000_i1301"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image375.png">，<imgwidth="49"height="22"v:shapes="_x0000_i1302"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image373.png">
④
<imgwidth="45"height="22"v:shapes="_x0000_i1303"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image371.png">，<imgwidth="49"height="22"v:shapes="_x0000_i1304"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds03.files/image377.png">
【单选题】
对总体<imgwidth="84"height="22"v:shapes="_x0000_i1318"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image412.png">的均值<imgwidth="12"height="14"v:shapes="_x0000_i1319"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image414.png">做区间估计，得到置信度为95%的置信区间，意义是指这个区间（）
①
平均含总体95%的值
②
平均含样本95%的值
③
有95%的机会含<imgwidth="12"height="14"v:shapes="_x0000_i1320"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image414.png">的值
④
有95%的机会含样本的值
【单选题】
<imgwidth="18"height="18"v:shapes="_x0000_i1269"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image290.png">为同阶方阵，<imgwidth="66"height="114"v:shapes="_x0000_i1270"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image292.png">且<imgwidth="100"height="24"v:shapes="_x0000_i1271"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image294.png">，当（）时，<imgwidth="48"height="18"v:shapes="_x0000_i1272"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image296.png">
①
<imgwidth="90"height="24"v:shapes="_x0000_i1273"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image298.png">
②
<imgwidth="58"height="22"v:shapes="_x0000_i1274"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image300.png">
③
<imgwidth="58"height="22"v:shapes="_x0000_i1275"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image302.png">
④
<imgwidth="58"height="22"v:shapes="_x0000_i1276"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image300.png">且<imgwidth="58"height="22"v:shapes="_x0000_i1277"src="http://wljy.whut.edu.cn/uploadfiles/word/xxds05.files/image302.png">