Alternatively, a cycle can begin in a separate output criterion of an activity and end in a separate input criterion of this or another activity.
另外，循环也可以从活动的单独输出条件开始，并在该活动或其他活动的单独输入条件中结束。
2
Usually one step in the cycle serves as the basis for the next step, and the output of a former step is the input for the current one.
通常循环中的一个步骤被看作是下一个步骤的基础，上一个步骤的输出是当前步骤的输入。
3
The theory research results of one cycle controlled switching power amplifier show that the output signal follow the input signal linearly, and the control performance is decided by output filter.