feedback counter的用法和样例：
例句
- The maximum count of a combination counter is thus a function of the number of stages of the binary and feedback counters.
组合计数器的最大数值是二进制计数器和反馈计数器的级数的函数。 - It should be noted that at the beginning of their operation the feedback counters must be cleared.
我们必须注意，反馈计数器在开始工作前，必须首先清除。
