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химиялық рефератты қызметнің (ХРҚ) тіркеу нөмірі
The Chemical Abstracts Service Registry Number (CAS) is a numeric designation assigned by the American Chemical Society's Chemical Abstract Service and uniquely identifies a specific compound. This entry allows one to conclusively identify a material regardless of the name or naming system used.
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The second largest of the Great Lakes of North America, bounded on the west by Michigan (U. S. ) and on the north and east by Ontario (Can. ). The ...
