You Do Need power plug adapter while traveling from Dominican Republic to Tanzania.

Here is Why You Need An Adapter

The outlet and plug type used in Tanzania are D and G and in Dominican Republic are A, B and C. This is how they look like.

Dominican Republic

In Dominican Republic, outlets of type A, B and C are in use.

Type A

Type B

Type C

Tanzania

In Tanzania, outlets of type D and G are in use.

Type D

Type G