改变200年以来利用锌金属易于弯折、剪焊等加工特性而限于作为制造屋面天沟及排水管之用。
This invention changes its 200 years history of limitation to roof gutter and drainpipe, due to its easy bending, cutting and welding property.
改变200年以来利用锌金属易于弯折、剪焊等加工特性而限于作为制造屋面天沟及排水管之用。
This invention changes its 200 years history of limitation to roof gutter and drainpipe, due to its easy bending, cutting and welding property.
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