Answer:
A: Plane - A flat surface such as a sheet of metal or a machined surface on a part could be used as a plane datum.
B: Line - A straight edge such as a ruler or a machined edge on a part could be used as a line datum.
C: Point - A small pin or a sharply pointed tool could be used as a point datum.
D: Cylinder - A cylindrical surface such as the exterior of a cylinder or a round rod could be used as a cylinder datum.
E: Contoured surface - A surface with a specific shape or contour, such as a curved or angled surface, could be used as a contoured surface datum.
Step-by-step explanation:
These are just a few examples, and there are many other physical components that could be used to create locating features for each of these datum types. The specific components used may depend on the specific application and the requirements for the part or assembly being measured.