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。

youdao

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。

youdao