结构推理 Periodic checks are automatically performed to insure that the entire system is operating correctly and that no failures have occurred, unnoticed, that would affect the count data.
【正确答案】计数器能自动地作定期检查，保证整个系统正常工作，并不使那些会影响计数数据的任何故障出现或被忽视。
【答案解析】