If a system can transfer toward arbitrary desired state from the arbitrary initial state within a finite time interval under the governing of the control action, then it has controllability.
系统在控制作用支配下能够在有限时间间隔内从任意初始状态向任意希望状态转移，则其具有能控性。
The system consists of a programme contactor, a automatic transfer device which was completely designed and built by ourselves, a time interval counter and a digital recoder.
此系统由程序接触器、自制的时刻比对自动转换器、时间间隔计数器和数字打印机组成。
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