NC 48-20-1988 Hydraulics and Hydrology Stoppers for Irrigation Installations Quality Specifications《水压和水文地理学 灌溉装置塞子 质量规格》.pdf

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NC 48-22-1988 Hydraulics and Hydrology Elbows for Irrigation Installations Quality Specifications《水压和水文地理学 灌溉装置肘 质量规格》.pdf

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