1. Section (f):
A part usually refers to an area, a part or a part. For example, you can say "China is divided into several parts, such as North China, South China and Central China". The "plate" here refers to the division within a larger area.
2. Plate:
Plate usually refers to a large continuous geographical area, usually composed of geological structures. For example, you can say that "the earth's surface is composed of multiple plates, such as Eurasia plate and America plate". The "plate" here refers to a large tectonic area on the earth's surface.
In short, a plate usually represents a part or a partition in an area, while a plate represents a continuous and large geographical area. Depending on the context, you can decide which word to use.