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Engineering Drawing is a graphical language used by engineers and other technical personnel associated with the engineering profession. used причастие второе 
A drawing of an object is prepared to define its shape and to specify its size. prepared причастие второе
convenient scale is chosen to prepare the drawings of big as well as small objects in proportionately smaller or larger size  chosen причастие второе
here are a number of drawing types associated with the mechanical engineering design process. associated причастие второе
The assembly drawing will generally include at least three orthographic views with sections as needed to clearly show all of the details and their relative positions. Overall and detail dimensions will be shown.
All individual items required to produce mechanical equipment need to be described in some detail to ensure that they are manufactured in accordance with the designers requirements
Proprietary items are selected from technical data sheets obtained from manufacturer /supplier.

he purpose of engineering drawing is to convey graphically the ideas and information necessary for the construction or analysis of machines, structures, or systems.   is to использыется как модальный глагол должен
Items manufactured specifically for the application need to be made to detail drawings which include the geometry, material, heat treatment requirements, surface texture, size tolerances, geometric tolerances etc.
The detail drawing should include all of the necessary information to enable procurement, manufacture and should identify all of the relevant codes and standards. The item weight/mass should also be included for reference.  shоuld модвльный глагол
Depending on the level of detail, a detail drawing can comprise one drawing on a sheet or a number of separate drawings on one sheet can модальный глагол
Drawing of very big objects cannot be prepared in full size because these would be too big to accommodate on the drawing sheet.  cannot модальный глагод  prepared  причастие второе