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ThinkPadL420、L421和L520 · 2011-12-02 · 电池 危险 Lenovo制造的个人计算机包含为系统时钟供电的纽扣电池。此外,许多移动式 产品(如笔记本计算机)在便携方式下利用可充电电池提供系统电源。Lenovo
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