You Do Need power plug adapter while traveling from Argentina to China.

Here is Why You Need An Adapter

The outlet and plug type used in China are A, C and I and in Argentina are C and I. This is how they look like.

Argentina

In Argentina, outlets of type C and I are in use.

Type C

Type I

China

In China, outlets of type A, C and I are in use.

Type A

Type C

Type I