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PCB Pol了ehlorinated BiphenylPCH Polyeyelie HydroearbonsPFD Maximum Permissible Power FI让x DensitvPMR Proportional Mortality RatiopPb part per billionPPm Part Per millionPPt part Per trillionPVC Polyvinyl ChlorideLRN人Ribonucleie AeidRR .Relative RiskSC
PCB Polled ehlorinated BiphenylPCH Polyeyelie Hydroearbons PFD Maximum Permissible Power FI x DensitvPMR Proportional Mortality RatiopPb part per billion PPm Part Per million PPt part Per trillion PVC Polyvinyl Chloride LRN Human Ribonucleie AeidRR. Relative RiskSC