http://anna-bpguide.livejournal.com/ ([identity profile] anna-bpguide.livejournal.com) wrote in [personal profile] anna_bpguide 2013-05-02 06:23 am (UTC)

вот и я не знаю.
Там по ссылке http://engineering-ru.livejournal.com/71388.html?view=2539228#t2539228 - инженерное сообщество пытается на мой дилетантский вопрос ответить, но как-то не очень убедительно.
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