Monofilament for bamboo charcoal air filter and its preparation process and use
                        
                        A double-layer honeycomb structure filter
                        
                        A kind of filter material and its preparation method and use
                        
                        A surface leveling treatment method of air framed filter
                        
                        The use of a plate heat ventilation and a container whose housing contains at least one such plate heat ventilation
                        
                        Photocatalyst antibacterial and mildew proof negative ion polypropylene monofilament and its preparation method and use
                        
                        Conductive masterbatch, conductive polymer monofilament and preparation method and use
                        
                        Monofilament capable of emitting negative ions and preparation method and use