general principle of energy audit on industrial and commercial enterprise
Related Translations:
汽车道路试验方法通则: motor vehicles general rules of road test methodd
能源: the sources of energy; energy resources; energy source; energy◇能源短缺 energy shortage; 能源工业 energy industry; 能源构成 energysource composition; 能源管理 energy control; 能源合作 cooperation in the field