DIN 4751-3 (1993-02)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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