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VEDA a TECHNIKA

VEDA a TECHNIKA. Z čoho by ste vyrobili gumu?. ... z prírodného alebo syntetického kaučuku. Mosadz je zliatina ktorých kovov ?. Mosadze sú zliatiny medi (Cu) s 5 - 40 % zinku (Zn). Ako sa volá prvý slovenský kozmonaut a Remek to nie je?. Ivan Bella.

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VEDA a TECHNIKA

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