http://bbs.52rd.com/?284405
科玛通信专注于时间频率控制器组件产品研发及生产.历经长达5个月的时间，研制出单槽控温高稳恒温晶体振荡器，频率稳定度高达3E-12@1s，5E-12@100s.并具有整洁的 ...
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