一、引言 随着工业大生产运动的不断推进,社会的分工越来越明确,采取集中供热方式后,产热方、供热方、用热方经济利益的矛盾有时会越来越突出。由此带来了对计量器具的准确度要求也越来越高,计量器具实行定期检定已经到了刻不容缓的时期。但由于目前市场上所提供的绝 I. INTRODUCTION With the continuous promotion of the large-scale industrial production movement, the division of labor in the society has become clearer and clearer. The conflicts between the economic interests of the heat-producing party, the heating party and the hot party have become increasingly prominent after the centralized heating is adopted. This has brought the requirements of the accuracy of measuring instruments is also getting higher and higher, measuring instruments to implement a regular test has reached an impending period. However, due to the current market provided by the absolute