air-conditioning maintenance, and change machines, installation, and fluid, cleaning and maintenance; <br> 2, refrigerator, freezer, refrigerator, ice-making machines and other refrigeration equipment maintenance; <br> 3, washing machines, color televisions, monitors, microwave ovens and other maintenance; <br> 4, water heaters, fume machines, such as cleaning gas stove maintenance. <br> 5, various types of foreign...
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