【单选题】【消耗次数：1】
计算工字形梁的抗弯强度，用公式Mx/yxWnx≤f,取yx=1.05梁的翼缘外伸肢宽厚比不小于（）。
①
<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203173347_758.png"/>
②
<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203172523_453.png"/>
③
<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191120/20191120171553_415.png"/>
④
<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203173359_603.png"/>
参考答案：
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变压器负载运行时，随着负载电流的增大，其铁心损耗<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100008_669.png"/>和铜损耗<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100015_370.png"/>会（）
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<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095355_176.png"/>不变，<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095359_427.png"/>增大
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都会增大
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甲乙两个车间工人日加工零件数的均值和标准差如下:甲车间:<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191204/20191204133016_901.png"/>=70件,<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191204/20191204133853_863.png"/>=5.6件,乙车间:<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191204/20191204132636_598.png"/>=90件,<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191129/20191129164519_624.png"/>=6.3件,哪个车间日加工零件的离散程度较大()
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甲车间
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两个车间相同
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单相变压器磁路饱和时，主磁通<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205101139_207.png"/>和励磁电流<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100752_202.png"/>的波形（）
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同时为正弦波
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不会同时为正弦波
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额定电压为220/110V的单相变压器，低压边漏电抗为0.075<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095750_736.png"/>，折合到一次侧为：
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0.075<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100447_597.png"/>
②
0.15<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100458_35.png"/>
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计算工字形梁的抗弯强度，用公式<imgwidth="45"height="45"id="对象3"src="http://wljy.whut.edu.cn//uploadfiles/word/gcjg002.files/image003.png">≤f，取γx=1.05，梁的翼缘外伸肢宽厚比不小于（）。
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13<imgwidth="35"height="33"id="对象5"src="../uploadfiles/word/gcjg002.files/image002.png">
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(10+0.1λ)15<imgwidth="35"height="33"id="对象6"src="../uploadfiles/word/gcjg002.files/image002.png">
④
915<imgwidth="35"height="33"id="对象7"src="../uploadfiles/word/gcjg002.files/image002.png">
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根据等效关系的传递性，若有状态<imgwidth="24"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj056978.png">和<imgwidth="25"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057002.png">等效，又有状态<imgwidth="25"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057032.png">和<imgwidth="25"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057056.png">等效，则状态<imgwidth="24"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057085.png">和<imgwidth="25"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057109.png">也等效。正确的写法是：______。
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(<imgwidth="24"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057153.png">,<imgwidth="25"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057177.png">),(<imgwidth="25"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057203.png">,<imgwidth="25"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057227.png">)-à(<imgwidth="50"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057254.png">)
②
(<imgwidth="50"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057281.png">),(<imgwidth="54"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057307.png">)-à(<imgwidth="50"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057334.png">)
③
(<imgwidth="24"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057361.png">,<imgwidth="25"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057385.png">),(<imgwidth="25"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057411.png">,<imgwidth="25"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057435.png">)-à(<imgwidth="24"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057462.png">,<imgwidth="25"height="34"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj05.files/szlj057486.png">)
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关于三相异步电动机转子边产生的磁动势<imgalt=""src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205101252_49.png"/>的旋转速度说法正确的是（）
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③
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【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】
设总体<imgwidth="14"height="14"v:shapes="_x0000_i1069"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image002.png">服从两点分布：<imgwidth="259"height="20"v:shapes="_x0000_i1070"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image080.png"><imgwidth="75"height="26"v:shapes="_x0000_i1071"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image081.png">为其样本，则样本均值<imgwidth="12"height="18"v:shapes="_x0000_i1072"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image083.png">的期望<imgwidth="49"height="20"v:shapes="_x0000_i1073"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image085.png">（）
①
<imgwidth="12"height="18"v:shapes="_x0000_i1074"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image087.png">
②
<imgwidth="18"height="22"v:shapes="_x0000_i1075"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image089.png">
③
<imgwidth="32"height="22"v:shapes="_x0000_i1076"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image091.png">
④
<imgwidth="20"height="22"v:shapes="_x0000_i1077"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image093.png">
【单选题】
设总体<imgwidth="84"height="22"v:shapes="_x0000_i1356"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image412.png">，<imgwidth="20"height="20"v:shapes="_x0000_i1357"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image461.png">未知，<imgwidth="75"height="26"v:shapes="_x0000_i1358"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image476.png">是来自<imgwidth="12"height="14"v:shapes="_x0000_i1359"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image426.png">的样本，<imgwidth="12"height="20"v:shapes="_x0000_i1360"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image478.png">为样本均值，<imgwidth="12"height="14"v:shapes="_x0000_i1361"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image480.png">为样本标准差。是检验问题为<imgwidth="164"height="22"v:shapes="_x0000_i1362"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image482.png">则检验的统计量为（）
①
<imgwidth="135"height="35"v:shapes="_x0000_i1363"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image484.png">
②
<imgwidth="135"height="35"v:shapes="_x0000_i1364"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image486.png">
③
<imgwidth="135"height="37"v:shapes="_x0000_i1365"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image488.png">
④
<imgwidth="115"height="37"v:shapes="_x0000_i1366"src="http://wljy.whut.edu.cn:80/uploadfiles/word/xxdsb11.files/image490.png">
随机题目
【多选题】
一夫一妻制的基本要求有哪些？（ ）
①
任何人都不得同时有两个或两个以上的配偶
②
已婚者也就是有夫之妇或者有妇之夫，在其配偶死亡或离婚前不得再行结婚
③
一切公开的、隐蔽的一夫多妻、一妻多夫都是非法的，受到法律的禁止和取缔
④
违反一夫一妻制情节轻微的，要予以批评教育或行政处分；情节较重的，应给予行政处罚；情节严重构成犯罪的，要受到刑法制裁
【单选题】
人类社会的婚姻结构从杂乱的两性关系经过（ ），这是必然的普遍规律。
①
群婚制、一夫一妻制，最后进入了对偶婚制
②
群婚制、对偶婚制，最后进入了一夫一妻制
③
对偶婚制、群婚制，最后进入了一夫一妻制
④
一夫一妻制、群婚制、最后进入对偶婚制