seal coats 中文意思是什麼
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Specification for seal coats on cement mortar lined ductile iron pipes and fittings
水泥砂漿襯砌的可鍛鐵管和管件密封塗層規范 -
Slurry seal coats
稀料封層 -
Ductile iron pipes and fittings - seal coats for cement mortar linings
球墨鑄鐵管和配件.水泥灰漿襯套的密封塗層
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