Davriy jadvalda nechta element bor?, 118, 128, 110, 98, Kislorodning kimyoviy belgisi?, O, H, K, Oc, Suvning kimyoviy formulasi?, H2O2, H2O, H3O, togri javob berilmagan, Eng yengil metall?, H, O, Li, Na, rasmda nima tasvirlangan?, menzurka, olchov silindiri, Probirkalar, Kolbalar.

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