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电热水器买一级好还是二级好

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燃气热水器一级能效好还是二级能效好?

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电热水器买一级好还是二级好

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热水器为啥要买二级能效的

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燃气热水器有必要买一级能效

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燃气热水器一级能效比二级能效节约多少

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燃气热水器一级能效和二级能效的差别

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