A、已知CP,D和T的输入波形如图,试画出其相应的输出波形。设初态Q=0。<img src="https://img.ppkao.com/2018-08/chenfang/2018082415113466824.jpg" />
A、已知CP,D和T的输入波形如图,试画出其相应的输出波形。设初态Q=0。<img src="https://img.ppkao.com/2018-08/chenfang/2018082415113466824.jpg" />
A、A.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018082216301263809.jpg" />
B.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018082216301513758.jpg" />
C.<img src="https://img.ppkao.com/2018-08/longzhengxuan/201808221630286940.jpg" />
D.<img src="https://img.ppkao.com/2018-08/longzhengxuan/2018082216303362301.jpg" />
A、设总体X服从T分布,其概率密度为
<img src="https://img.ppkao.com/2019-04/wuacheng/2019041817223067284.jpg" />
其中参数α>0,β>0。如果样本观测值为<img src="https://img.ppkao.com/2019-04/wuacheng/2019041817225019568.jpg" />
(1)求参数α及β的矩估计值;
(2)已知<img src="https://img.ppkao.com/2019-04/wuacheng/2019041817230693425.jpg" />求参数的极大似然估计值。
A、圆截面简支梁如图所示,已知F=1KN,回答下列问题。 <img src="https://img.ppkao.com/2018-06/liuqianlan/2018061309453811961.jpg" />
A、<img src="https://nimg.ppkao.com/2019-04/wanxiaokui/2019041417222229393.jpg?sign=65fe63a2dc1ac5939ef1e50518c7639d&t=62d5681b" /> B、<img src="https://nimg.ppkao.com/2019-04/wanxiaokui/2019041417222784710.jpg?sign=580bdb3b51046719df78b3c7684de0f9&t=62d5681b" /> C、<img src="https://nimg.ppkao.com/2019-04/wanxiaokui/2019041417224093184.jpg?sign=e05fcf9a909f813265e2eb5572bc6695&t=62d5681b" /> D、<img src="https://nimg.ppkao.com/2019-04/wanxiaokui/2019041417224550317.jpg?sign=b20533ed0860a901defb005ebde6516f&t=62d5681b" />
A、<img src="https://nimg.ppkao.com/2019-04/wanxiaokui/2019041416522997236.jpg?sign=4d66a6a45c3b54b05f40bd10981970fd&t=62d601cf" /> B、<img src="https://nimg.ppkao.com/2019-04/wanxiaokui/2019041416523266824.jpg?sign=05c4dd8e749ccf08a47080294f1271ab&t=62d601cf" /> C、<img src="https://nimg.ppkao.com/2019-04/wanxiaokui/2019041416523774386.jpg?sign=a012a29b65e9d3278742bc008b3c4e96&t=62d601cf" /> D、<img src="https://nimg.ppkao.com/2019-04/wanxiaokui/201904141652417150.jpg?sign=b7b49b3a1ebdcb705a28c451034d86f7&t=62d601cf" />
A、圆截面简支梁如图所示,已知F=1KN,回答下列问题。 <img src="https://img.ppkao.com/2018-06/liuqianlan/2018061309453811961.jpg" />
A、<img src="https://nimg.ppkao.com/2018-09/lina/2018090609012294381.jpg?sign=6f2cc0e321ffc289bed471b9ae237fa3&t=62d2c9c0" /> B、<img src="https://nimg.ppkao.com/2018-09/lina/2018090609012623027.jpg?sign=3a94c52c795c04c474b7929dba6b98ea&t=62d2c9c0" /> C、<img src="https://nimg.ppkao.com/2018-09/lina/2018090609013065087.jpg?sign=c9e7060b9514770d0991f61613399ff0&t=62d2c9c0" /> D、<img src="https://nimg.ppkao.com/2018-09/lina/2018090609013525845.jpg?sign=9d7c20fd2d6057796751e67a75ceb91a&t=62d2c9c0" />
A、已知逻辑函数的对偶式为<img src="https://img.ppkao.com/2019-04/wangjue/2019041614380079008.jpg" />,则它的原函数为()。
A、<img src="https://nimg.ppkao.com/2017-07/tangxueping/2017072017550716533.jpg?sign=ea3de106614039d28ecfb8b557ffe709&t=62d2ed1b" />(惯性矩) B、<img src="https://nimg.ppkao.com/2017-07/tangxueping/2017072017551424363.jpg?sign=ebe99f79144d058f5c0a04c4b05ce2f2&t=62d2ed1b" /> C、<img src="https://nimg.ppkao.com/2017-07/tangxueping/2017072017551967.jpg?sign=725ba72501cc8ad74e7d235c5bc98800&t=62d2ed1b" /> D、<img src="https://nimg.ppkao.com/2017-07/tangxueping/2017072017552544094.jpg?sign=07285502cee53762fc66d44f028e5c2d&t=62d2ed1b" />(抗弯截面模量)