DIN 4751-3 : 1993被替代
MEDIUM TEMPERATURE HOT WATER SYSTEMS (MTHWS) WITH A BOILER FLOW TEMPERATURE UP TO 95 DEGREE C AND FORCED FLOW BOILERS WITH RATED OUTPUT UP TO 50 KW - SPECIFICATION FOR SEALED SYSTEMS USING THERMOSTATIC CONTROL - SAFETY EQUIPMENT
出版：German Institute for Standardisation (Deutsches Institut für Normung)
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