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Hb=20.64m,B点比A点高 Hb=20.44m,B点比A点高 Hb=20.44m,B点比A点低 Hb=20.64m,B点比A点低
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HB=20.64m,B点比A点高 HB=20.44m,B点比A点高 HB=20.44m,B点比A点低 HB=20.64m,B点比A点低