Use a scraper to remove the loose paint coating from the wall first and clear the dust, dirt, sand, oil and mold with a wet rag completely.
请将准备要处理的墙面进行清洁，用刮刀刮除松脱漆膜并以湿抹布清除粉尘，特别是污垢、灰尘、砂土、油渍或发霉等处皆请先彻底清理。
The additive of correcting metal penetration for green sand mold casting, made from the waste of oil further fabricated——namely DK material, is researched in this paper.
研制了利用植物油深加工后的废料———DK材料作为铸造用湿型砂防粘砂添加剂。
The additive of correcting metal penetration for green sand mold casting, made from the waste of oil further fabricated——namely DK material, is researched in this paper.
研制了利用植物油深加工后的废料———DK材料作为铸造用湿型砂防粘砂添加剂。
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