When exciting Sin voltage source is applied to proper port, the stability of network depends on the sign of active and reactive components for fundamental-wave current enteringport of networks.
若在适当端口施加正弦电压源，则网络的稳定性取决于进入端口基波电流的实功与虚功成份的符号值。
3
The cruise ship collided with a Belgian cargo ship, Lowlands Longevity, whilst entering the port in Shanghai.