皮皮学，免费搜题
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搜题
【单选题】
铅酸蓄电池正极板上的活性物质是二氧化铅,呈A.
表灰色
B.
棕红色
C.
银灰色
D.
黄 色
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】A bookless life is an incomplete life. Books influence the depth and breadth of life. They meet the natural______47_____for , for expression, for creativity and beauty of life. Learners, theref...
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