The common feature of the problems was SunTour's small size.
这些问题的一个共同特点是山图的小尺寸。
This series feature are small size, high thermal efficiency, and easy installation and operation.
该系列产品体积小、热效率高、安装使用方便。
This series feature are small size, high thermal efficiency, and easy installation and operation.
该系列产品体积小、热效率高、安装使用方便。
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