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林区公路涵洞
释义
林区公路涵洞
Encyclopedia
农学
林区道路与桥梁
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forest highway culvert
林区公路涵洞
为保证地面水流能够横穿林区公路而设置的一种小型构造物。
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filter mass method
filter material for dust removal
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filter of a lattice
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filters for black-and-white photography
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