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1: Active solar heating system 2: Soil 3: Community 4: Feeder 5: Lead 6: Human 7: Water 8: Range 9: Environment 10: Current 11: Fishery 12: Atom 13: Carbon 14: Process 15: Electricity 16: Contamination 17: Condition 18: Plant 19: Hazard 20: Conservation (As of 17:49)
The Repeatability is the degree of agreement between independent test results produced by the same analyst, using the same test method and equipment on random aliquots of the same sample within a short time period.