porus多孔层空心柱 porus–layer open tubular column Porous-Layer Open-Tubular (chromatograph)多孔Open-Tubular(色谱) Platform OmgevingstechnologieOmgevingstechnologie平台 Porous Layer Open Tubular多孔层开管 porous layer open tubular column多孔层开放管状柱 Vector graphics (Unix Plot(5) format)向量图形(Unix地块(5)格式)