Ինչպե՞ս կարող ենք օգնել:
Kai Burghardt
https://ORCID.org/0000-0003-2117-3974
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Unsupported browsers – please stick to industry standards (HTML5, CSS3, …) not vendor‑specific extension
Please remove this stupid Khan Academy does not support this browser.To use Khan Academy you need to upgrade to another web browser. Just select one of the options below to start upgrading.Mowzill...
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Total activity 241
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Last activity
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Member since
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Following 0 users
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Followed by 1 user
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Votes 193
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Subscriptions 21
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Total activity 241
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Last activity
-
Member since
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Following 0 users
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Followed by 1 user
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Votes 193
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Subscriptions 21