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The isometric drawing is the best choice for showing how a piping system is assembled because it represents three-dimensional objects in two dimensions. This type of drawing allows for a clear and visual representation of the spatial relationships and angles between different components of the piping system. The isometric view helps illustrate how pipes, fittings, valves, and other elements are connected, allowing the viewer to understand both the layout and the assembly process easily.

Unlike a top view, which presents a view from above that may obscure vertical information, or a side view, which primarily shows the height and depth but lacks comprehensive detail about the layout, the isometric drawing conveys depth and orientation simultaneously. While sectional views provide insights into the interior details of the structure by cutting through it, they do not effectively illustrate how components fit together in a complete system. Therefore, the isometric drawing stands out as the most informative and effective method for demonstrating the assembly of piping systems.