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恩格爾定律
释义
恩格爾定律
ēn gé ěr dìng lǜ
十九世纪德国统计学家恩格尔所发现的定律。即当一个家庭的所得增加时,其用于食物的支出占所得的比例愈低。德Engelsches GesetzS, Wirtsch
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bevelled gear jack
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bevel l er
bevelments
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bevel mortise wheel
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更新时间:2026/8/23 9:43:40