Typical (in one room!) are the flat Type A and angled Type I and the round pins you find in Europe. There are frequently two different types in a given outlet box. I haven't seen Type G in China, although you find them in Singapore and Hong Kong. Besides the two-pin type A, some outlets have a third (round) grounding pin, with the other two holes accepting both round and flat pins.
If you're bringing an adapter, I'd recommend
1) one that fits into the three-angled-pin outlet and into which you can plug two- or three-pin plugs. I often get a nasty spark plugging my three-pin computer power supply into an adapter without a ground, and once blew a power supply using a groundless adapter.
2) one that fits into a two-pin round outlet and accepts two-pin flat appliances…this one is less important, but is compact and light.
Last edited by BrianMinn; Aug 19, 2011 at 1:11 pm