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使用一粒 3 伏 (cr2032) 纽扣电池，用于在电源不供电时为实时时钟 (rtc) 供电。
a 3 volt, (cr2032) coin cell is used to supply power to the real time clock (rtc) when power is not available from the power supply.
Last Update: 1970-01-01
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