线路M侧电源阻抗为10Ω，线路阻抗为20Ω，线路N侧电源阻抗为20Ω，问该系统振荡中心距M侧的阻抗为多少Ω？（假设两侧电源阻抗的阻抗角与线路阻抗角相同）

翻译：With Average or With Particular Average（WA or WPA）（）

节点阻抗矩阵与电路中学过的回路阻抗矩阵有什么不同？

如图所示为一5节点网络，已知各支路阻抗标幺值及节点编号顺序。 形成节点导纳矩阵Y

如图所示为一5节点网络，已知各支路阻抗标幺值及节点编号顺序。 计算与节点4对应的一列阻抗矩阵元素

如图所示为一5节点网络，已知各支路阻抗标幺值及节点编号顺序。 对Y矩阵进行LDU分解

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

电力系统中的（）元件只要三相对称，其正序阻抗和正序导纳分别与负序阻抗和负序导纳相等。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。