Applying a direct current channel to the system to make it possible that the system be used under both static and dynamic situation . and the phrase discrepancy will be limited between 0 - 15 under dynamic situation ; 2 对于整个系统采取了直流通道，使系统能够运用在静态和动态两种工作模式下，而且在动态模式下，使系统的相位差限定在0 15之间； 2
