GB/T 39938-202 1/IEC 62999 :2016.Electric room heating一Underfloor heating一Performance characteristic...
GB/T 39938-2021 室内电取暖 地暖 性能特征定义、测试方法、尺寸和公式符号
GB/T 39938-2021.Electric room heating一Underfloor heating-Performance characteristics-Definitions,met...