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与多种能够自行更换电池的手机相比,苹果公司长期拒绝提供面向消费者的电池零售及自行更换服务,以提升 单纯 更换电池的成本,促使用户直接 购买新 手机。提升电池容量的 有效方法包括 ( )。A.
增大电池的整体体积
B.
改善电池的内部结构
C.
使用高效的电池材料
D.
降低电池的内部损耗
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