cast-iron gilled tube economizer
... 鳍片管式省煤器finned tube economizer 铸铁肋片管式省煤器cast-iron gilled tube economizer 可分式省煤器(独立式省煤器)separated economizer ...
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iron gilled tube economizer
... 鳍片管式省煤器 finned tube economizer 铸铁肋片管式省煤器 cast-iron gilled tube economizer 可分式省煤器（独立式省煤器） separated economizer ...
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