Wyszukano: Kulki z tworzywa sztucznego
Coloured plastic beads can be a useful addition to the classroom in creating visual demonstrations of various procedures or internal biological systems, such as interactions between proteins and the proliferation of disease or a virus as it spreads through the body. They come in a variety of sorted colours, with precisely cut holes and uniform sizing. Plastic beads are economical, inert, and durable under conditions of constant, heavy use.
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