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How about Four Seasons Mu Ge 18 Guanchengju Series?

Cheng Ju series is a series installed and used by this brand in a large area of the residential area, commonly known as: engineering machine (this series was previously called gathering together, changing the soup without changing the medicine). Advantages are simple installation and large profit margin (to put it bluntly, it can be given to the property and the competent department ... you know. Disadvantages are: poor heat preservation performance, poor heat collection performance of vacuum tubes, and rainy weather will be fine (manufacturers should control costs). )