A、已知某电路的结点方程为
<img src="https://img.ppkao.com/2019-04/wangxuan/2019042916002282377.jpg" />
A、已知某电路的结点方程为
<img src="https://img.ppkao.com/2019-04/wangxuan/2019042916002282377.jpg" />
A、为确定多方过程方程<img src="https://img.ppkao.com/2019-04/wuacheng/2019042417173631401.jpg" />中的指数n,通常取<img src="https://img.ppkao.com/2019-04/wuacheng/2019042417175319349.jpg" />为纵坐标,<img src="https://img.ppkao.com/2019-04/wuacheng/2019042417180750358.jpg" />为横坐标作图。试讨论在这种中多方过程曲线的形状,并说明如何确定n。
A、试根据<img src="https://img.ppkao.com/2019-04/leiyawen/2019041411122516845.jpg" />导出泡点方程;并列出试算法确定某一温度下泡点压力的试算步骤。
A、A.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042817170370385.jpg" />
B.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042817170765762.jpg" />
C.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042817171081633.jpg" />
D.<img src="https://img.ppkao.com/2019-04/xiaotian/2019042817171338858.jpg" />
A、维里方程可以表达成以下两种形式。
<img src="https://img.ppkao.com/2019-04/wuacheng/2019042316165817510.jpg" />
请证明:<img src="https://img.ppkao.com/2019-04/wuacheng/2019042316171461717.jpg" />
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、如题图所示,设B点发出的平面横波沿BP方向传播,它在B点的振动方程为<img src="https://img.ppkao.com/2019-04/liyunao/2019041616333460033.jpg" />
C点发出的平面横波沿CP方向传播,它在C点的振动方程为<img src="https://img.ppkao.com/2019-04/liyunao/2019041616334242069.jpg" />,本题中Y以m计,t以s计.设BP=0.4m,CP=0.5m,波速u=0.2m·s-1
<img src="https://img.ppkao.com/2019-04/liyunao/2019041616332795297.jpg" />
A、A.<img src="https://img.ppkao.com/2018-08/yiyu/2018082217423339315.jpg" />
B.<img src="https://img.ppkao.com/2018-08/yiyu/2018082217423966299.jpg" />
C.<img src="https://img.ppkao.com/2018-08/yiyu/2018082217424319040.jpg" />
D.<img src="https://img.ppkao.com/2018-08/yiyu/2018082217425167500.jpg" />