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【单选题】
下图是生活中常用的锌锰干电池的示意图，下列有关说法中不正确的是 [     ]
A.
电池内部含有电解质
B.
 锌是负极，碳棒是正极
C.
电子由碳棒经外电路流向锌
D.
锌锰干电池属一次电池
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