Germany to China: You'll need an adapter
You'll need a plug adapter: Germany uses Type C/F, China uses Type A/I, and they don't fit. Voltage is compatible (230V vs 230V), so any dual-voltage or matching device is fine either way.
You'll need a plug adapter: Germany uses Type C/F, China uses Type A/I, and they don't fit. Voltage is compatible (230V vs 230V), so any dual-voltage or matching device is fine either way.