سوال ۱۳ کنکور ارشد مهندسی مکانیک ۱۴۰۵

PASSAGE 1 (paragraph 2):

Instructions for manufacturing a part must be fed to the necessary machinery, either manually, through programmed instructions, or through the use of a Computer-Aided Manufacturing (CAM) or combined CAD/CAM program. An engineer may also have a part manually manufactured using the technical drawings, but this is becoming an increasing rarity, except in processes that cannot economically be done by a machine.

According to paragraph 2, why may an engineer have a piece manually manufactured using the technical drawings?