GB/T 30839.47-2018工业电热装置能耗分等第47部分:电热浴炉国家标准
英文:Energy consumption grading for industrial electroheat installations—Part 47 : Electric heating bath furnace GB/T 3083...
英文:Energy consumption grading for industrial electroheat installations—Part 47 : Electric heating bath furnace GB/T 3083...