计数器 (机械) - 立即要求一个报价
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计数器 (机械)

In general, a counter is a device which stores (and sometimes displays) the number of times a particular event or process has occurred, often in relationship to a clock signal. In practice, there are two types of counters:
up counters which increase (increment) in value
down counters which decrease (decrement) in value

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