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设置于海上、海岸或江河的易见处,以特定的标志、灯光、音响或无线电信号,用以帮助船舶定位、引导船舶航行、表示警告和指示碍航物的人工标志。全称助航标志。
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perfect rectangle
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perflectometer
perfluorinated ion exchange membrane for electrolysis
perfluorinated organic compound
perfluoroalkane
perfluorobutene
perfluorocarbon
perfluorokerosene
perfluorooctane sulfonate
perfluorooctane sulfonate (PFOS)
perfluorooctane sulfonate,PFOS
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