zhi leng kong diao he xin qi kan
工程技术 因子 制冷空调 zhi leng kong diao gong cheng ji shu qi kan yin zi
kong diao zhi leng shi he xin qi kan ma
制冷 nuan tong kong diao + zhi leng + he xin qi kan
暖通 nuan tong kong diao zhi leng he xin qi kan
制冷 zhi leng kong diao gong cheng he xin qi kan
zhi leng kong diao shi he xin qi kan ma