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Feb 20, 2019
Cyflwyniad i wanwyn rwber
Mae'n gorff uchel-elastig wedi'i wneud o rwber cyffredin. Mae gan y gwanwyn rwber fodwlws elastig bach ac mae ganddo ddadffurfiad elastig mawr ar ôl cael ei lwytho, a thrwy hynny
Mwy
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Feb 10, 2019