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【多选题】
下列叙述正确的是
A.
在氧化还原反应中，失去电子的物质，所含元素化合价降低
B.
凡是有元素化合价升降的化学反应都是氧化还原反应
C.
在氧化还原反应中一定所有的元素化合价都发生变化
D.
氧化还原反应的本质是电子的转移（得失或偏移）
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