gravity heating tube 重力式热管
gravity heating oil feed 重力自流加油
gravity heating return system 重力回水系统
gravity heating return of condensate 冷凝水重力回水
steam heating by gravity 重力式蒸汽供暖
gravity warm air heating system 重力式热风供暖系统
gravity circulating hot water heating 重力循环式热水采暖
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