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井道孔
well hole
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通道孔
access openings
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烟道孔
floss hole flue hole flue opening
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渠道孔隙;通道孔隙度
channel porosity
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进人道孔
manway
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频道孔雀翎
huir
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竖浇道孔
sprue hole sptue hole
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通道孔隙度
channel porosity
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鱼道孔口
fish-pass orifice
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