等效电源定理包括电压源等效（戴维南定理），和电流源等效（诺顿定理）两个定理。

戴维宁定理说明一个线性有源二端网络可等效为( )和内阻( )连接来表示。

戴维南定理只能够计算电路中某一支路的电流，若完成电路所有支路的计算则依靠支路电流法。

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.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

任何一个有源二端线性网络，都可以用一个等效电压源来代替，这个等效电压源的电动势等于该二端网络的（）。

戴维南定理实质是把含源二端网络等效为电压源与电阻（）的电路模型。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。