<p> 计算孔<img src="https://img.ppkao.com/2018-09/yuanhao/2018091711312874342.jpg" />和轴<img src="https://img.ppkao.com/2018-09/yuanhao/2018091711313576715.jpg" />的公差值。</p>
A、计算孔和轴
的公差值。
A、计算孔和轴
的公差值。
A、A.S=P+Q
B.<img src="https://img.ppkao.com/2018-08/lina/2018083117500491800.jpg"/>
C.<img src="https://img.ppkao.com/2018-08/lina/2018083117500988874.jpg"/>
A、A.<img src="https://img.ppkao.com/2019-04/xiaotian/2019041517035379211.jpg" />
B.<img src="https://img.ppkao.com/2019-04/xiaotian/2019041517035733869.jpg" />
C.<img src="https://img.ppkao.com/2019-04/xiaotian/2019041517040187655.jpg" />
D.<img src="https://img.ppkao.com/2019-04/xiaotian/2019041517040430083.jpg" />
A、A.<img height="31" src="https://img.ppkao.com/2018-08/longzhengxuan/2018082011084972801.jpg" width="43" />
B.<img height="42" src="https://img.ppkao.com/2018-08/longzhengxuan/2018082011085498333.jpg" style="width: 49px; height: 33px;" width="45" />
C.<img height="40" src="https://img.ppkao.com/2018-08/longzhengxuan/2018082011085966126.jpg" width="71" />
D.<img height="25" src="https://img.ppkao.com/2018-08/longzhengxuan/2018082011090399902.jpg" width="60" />
A、A.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042917175712037.jpg" />
B.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042917180085132.jpg" />
C.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042917180310884.jpg" />
D.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042917180684437.jpg" />
A、测量某电路的电流<img src="https://img.ppkao.com/2018-09/yuanhao/2018091309024728203.jpg" />,测量的标准差分别为<img src="https://img.ppkao.com/2018-09/yuanhao/20180913090252413.jpg" />,求所耗功率P=UI 及其标准差σP 。
A、计算图(c)所示侧方交会点2P的平面坐标。
<img src="https://img.ppkao.com/2017-06/xuyiying/2017062614163111726.jpg" />
A、设X=(X1,…Xp)′的协方差阵(p×p)为<img src="https://img.ppkao.com/2018-10/wangjing/2018100917075243497.jpg" />,0<p<1
证明:λ1=σ
A、完成下列反应 
(a) P4+HNO3<img src="https://img.ppkao.com/2019-04/wangjing/2019041416320257508.jpg" />
(b) AsCl3+H2O<img src="https://img.ppkao.com/2019-04/wangjing/2019041416320257508.jpg" />
(c) POCl3+H2O<img src="https://img.ppkao.com/2019-04/wangjing/2019041416320257508.jpg" />
(d) P4O10+H2O<img src="https://img.ppkao.com/2019-04/wangjing/2019041416320257508.jpg" />  
(e) P4O6+H2O<img src="https://img.ppkao.com/2019-04/wangjing/2019041416320257508.jpg" />
(f) Zn3P2+HCl(稀)<img src="https://img.ppkao.com/2019-04/wangjing/2019041416320257508.jpg" />
A、(内曼分配和按比例分配的均值和比例估计)有下列数据
<img src="https://img.ppkao.com/2019-04/xieting/2019041611071044619.jpg" />
1)采用按比例分层抽样的方法估计Y和P并计算其标准误;
2)采用奈曼分配的方法估计Y和P并计算标准误;