To show materials of construction in a sketch we can use?

Using section lining in a sketch is the appropriate method to show materials of construction. Section lining involves drawing lines in a specific pattern to indicate different materials within a cross-section of an object or structure. This technique helps in clearly differentiating various materials, such as concrete, steel, wood, etc., which is essential for understanding the design and structural integrity in engineering drawings.

It's important to grasp how section lining helps convey the construction materials effectively in engineering documents. While shading and color coding can enhance aesthetics or provide some visualization, they do not communicate material types as explicitly as section lining does. Shading is often used to convey depth or three-dimensionality rather than the specific material identity.

Cross-hatching can be useful in certain contexts, but the distinction between cross-hatching and hatching could lead to confusion in interpreting which specific materials are indicated. Thus, section lining provides a clear and standardized approach to indicating materials in technical drawings, making it the best choice for this scenario.