Sort of. The Chinese gov't has tried to keep a more or less stable exchange rate with mixed results:
--but if we really want call that 'pegged' then we need to decide which peg.
In contrast here's a list of 17 countries whose currencies have been pretty close to a dollar or a multiple for much longer time periods, and here's ten more countries that just use dollars period. No matter what you might hear on this thread from the hyperactive set, I had nothing to do with it...