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Can I use German Rail Pass?

Hi there!
I'm interested in the German Rail Pass but not sure whether i'm eligible for it.
I'm a citizen of China with 2-year residence permit in Germany.
According to the germanrailpass.com, it seems possible for me to travel with GRP as a Chinese citizen by using my Chinese passport. Could you pls confirm this for me?
Further more, if i purchase an online GRP with valid date on it and print it out, do I need to activate it by a DB office before starting my travel?

Best regards,