Please check your voltage requirements on your AC adapters; US is 110 Volts, China is 220 Volts; if you adapter says 100-240V or something like that, you're golden, if it says 110 V only or something like that, you do not plug it in to the outlets in China or the adapter will fry; if it says 220 V only, well you can plug it in anywhere really, but it won't get enough power in the US.
FYI, all Apple adapters of recent are 100-240V.