It seems to me that there is some problem (or a bug) with Google Chrome's font rendering engine.
When I enlarge the font size the problem still there, happening on different characters.
I keep on change the font size larger until no missing stroke, guess how large the fonts need to be...
Enlarge one level:
Enlarger once more, some stroke still missing:
Enlarge one more, finially no missing stroke, but the font size seems too large for a normal webpage:
It should be related to the font rendering engine of Google Chrome. Since there is no missing stroke when I use FireFox 3.0.1 on the same machine all font size: