The separation and purification processes of 2, 6-dmn from coal and petroleum tar are reviewed.
综述了从煤焦油和石油中分离提纯2,6 -二甲基萘工艺。
All 6 hatches of the vessel had been closed by wooden boards, covered with 3 layers of tar Pauline and held down by wooden wedges.
全船6个货舱口均系木质舱盖板，面上以三层油布复盖。再以木楔压紧。
All 6 hatches of the vessel had been closed by wooden boards, covered with 3 layers of tar Pauline and held down by wooden wedges.
全船6个货舱口均系木质舱盖板，面上以三层油布复盖。再以木楔压紧。
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