A young man of his years needed to have a separate room.他那个年纪的年轻人需要有个单独的房间。The ability to separate out reusable elements from other waste is crucial.能从其他废料中分离出可重复利用成分是很关键的。If prepared many hours ahead, the mixture may se...
The alkyd is cross - linked by the amino resin during baking.这种醇酸是氨基树脂在烘烤时交联而成.The reaction of catalpa oil, tung oil and hydroxyl - terminated polybutadiene gives alkyd resin with quick - drying property.利用梓油和桐油以及带端羟基的聚丁...