Frequencycontrol Technology, which can be used as automatic air exchanging and conditioning system in flower cultivation greenhouse, has high reliability and excellent control performance.
变频调速技术以其高可靠性及优良的控制性能，可以作为自动换气调温系统应用在花卉培育温室大棚中。
2
Methods of analyzing the dynamic performance of automaticcontrolsystem can include time domain analysis, frequency domain analysis and stability.
自动控制系统的动态性能的分析方法包括时域分析法，频域分析法，及稳定性判据。
3
The phase- locked loop is one kind of controlsystem which is able to achieve phase automatic lock, to compose frequency and to trace demodulation system.