碱性氮化物包括吡啶和喹啉.The basic nitrogen compounds include pyridines and quinolines.三 ( 8- 羟基 喹啉 ) 铝 ( Alq3 ) 是有机电致发光器件的 基础材料.Aluminum tris - ( 8 - hydroxyquinoline ) ( Alq _ 3 ) is one of fundamental materials for organic electr...
Purchase tax was not payable on goods for export.出口商品不需要交购买税。As the domestic market becomes saturated, firms begin to export the product.由于国内市场饱和，各公司开始外销。The Institute of Export now fears that 100,000 jobs will go.现在出口协会...