【单选题】【消耗次数：1】
设X1,X2,...,X8是来自正态总体 <img style=BORDER-BOTTOM: #ddd 1px solid; BORDER-LEFT: #ddd 1px solid; BACKGROUND: url(/files/js/ueditor/themes/default/images/word.gif) no-repeat center center; BORDER-TOP: #ddd 1px solid; BORDER-RIGHT: #ddd 1px solid src=/files/js/ueditor/themes/default/images/spacer.gif width=55 height=24 word_img=file:///C:\DOCUME~1\ADMINI~2.LEN\LOCALS~1\Temp\msohtml1\01\clip_image001.wmz/>的一个样本，令Y=（X1+X2+X3+X4）2+（X5+X6+X7+X8）2，若CY服从χ2分布，则C=（ ）
①
1/4
②
1
③
1/2
④
2
参考答案：
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相关题目
【单选题】
设X1,X2,...,X8是来自正态总体 的一个样本，令Y=（X1+X2+X3+X4）2+（X5+X6+X7+X8）2，若CY服从χ2分布，则C=（ ）
①
1/4
②
1
③
1/2
④
2
【单选题】
执行指令MOVX A，@DPTR时，<img width=21 height=13 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:\Users\ADMINI~1\AppData\Local\Temp\ksohtml207924\wps1.jpg style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>、<img width=19 height=12 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:\Users\ADMINI~1\AppData\Local\Temp\ksohtml207924\wps2.jpg style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>脚的电平为（ ）
①
WR高电平，RD低电平
②
WR低电平，RD高电平
③
WR高电平，RD高电平
④
WR低电平，RD低电平
【判断题】
每个<img width=14 height=15 src=https://main.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/temp/msohtmlclip1/01/clip_image002.gif style=background:url(https://main.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>次多项式在复数域中都有<img width=14 height=15 src=https://main.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/temp/msohtmlclip1/01/clip_image002.gif style=background:url(https://main.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>个根.
①
正确
②
错误
【单选题】
已知反应2NO(g)+2CO(g)<img width="29" height="16" src="https://www.icve.com.cn/common/js/ueditor/themes/default/images/spacer.gif" word_img="file:///C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/msohtml1/01/clip_image002.gif" style="background:url(https://www.icve.com.cn/common/js/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd"/>N2(g)+2CO2(g)的DH=-373.2kJ/mol,若提高NO和CO的转化率可采取
①
低温低压
②
低温高压
③
高温高压
④
高温低压
【单选题】
反应2SO2(g) + O2(g) <img width="27" height="16" src="https://www.icve.com.cn/common/js/ueditor/themes/default/images/spacer.gif" word_img="file:///C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/msohtml1/01/clip_image002.gif" style="background:url(https://www.icve.com.cn/common/js/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd"/>2SO3(g)达到平衡时,保持体积不变,加入惰性气体He,使总压力增加一倍则
①
平衡向右移动
②
平衡向左移动
③
平衡不移动
④
无法判断
【单选题】
如果商品X对于商品Y的边际替代率<img width=55 height=18 style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/Users/user/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif/>小于X和Y的价格之比，为使消费者实现效用最大化，则（ ）。
①
X和Y价格不变时，增加X的消费，减少Y的消费。
②
X和Y价格不变时，增加Y的消费，减少X的消费。
③
仅当X的价格降低时，增加X的消费。
④
仅当Y的价格降低时，增加Y的消费。
【单选题】
如果某消费者的<img width=87 height=37 src=http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif alt=http://mooc1-api.chaoxing.com/ananas/latex/p/2639229 word_img=file:///C:/Users/ADMINI~1/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif style=background:url(http://www.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>，他会（ ）。
①
增加X商品的购买，减少Y商品的购买；
②
减少X商品的购买，增加Y商品的购买；
③
同时增加X商品和Y商品的购买；
④
同时减少X商品和Y商品的购买。
【判断题】
两个零多项式的最大公因式是<img width=16 height=19 src=https://main.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/temp/msohtmlclip1/01/clip_image002.gif style=background:url(https://main.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>
①
正确
②
错误
【判断题】
如果矩阵<img width=16 height=18 src=https://main.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/spacer.gif word_img=file:///C:/temp/msohtmlclip1/01/clip_image002.gif style=background:url(https://main.ahjxjy.cn/design/html/js/vender/ueditor/themes/default/images/word.gif) no-repeat center center;border:1px solid #ddd/>是非退化的，那么它一定是可逆矩阵.
①
正确
②
错误
【单选题】
“ <img width="19" height="17" style="background: url(/project/js/ueditor/themes/default/images/word.gif) no-repeat center; border: 1px solid rgb(221, 221, 221);" src="/project/js/ueditor/themes/default/images/spacer.gif" word_img="file:///C:/Users/t410i/AppData/Local/Temp/msohtmlclip1/01/clip_image002.jpg"/>”是哪种装饰音的符号 （ ）
①
波音
②
倚音
③
回音
随机题目
【单选题】
生长发育评价中最重要和最常用的形态指标是（ ）。
①
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②
Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-font-kerning:1.0pt;}头围、胸围
③
Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-font-kerning:1.0pt;}身高、胸围
④
Normal 0 7.8 磅 0 2 false false false EN-US ZH-CN X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.5pt; mso-bidi-font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-font-kerning:1.0pt;}体重、头围