I sincerely seek advice from all the experts in drawing

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I work in water treatment, and I have pretty much mastered the basic CAD drawing techniques. However, process design involves issues that cannot be resolved by simply drawing a simple diagram. For example, when drawing a Roots blower aerator, in addition to the basic parameter dimensions provided by the manufacturer. The elastic valves, flanges, nuts, bolts, foot bolts, and gates inside cannot be replaced with simplified versions; there are also civil engineering-related water supply and drainage elements involved. My field of study is environmental engineering, and I have no experience with such things. And a fully specified version must be drawn, so it is necessary to refer to GB. However, when I entered “GB flange” on some national standard download websites or in search engines, I was unable to find any relevant standards on many occasions. My question is how to find these things as quickly as possible. Finally, I hope everyone can give some suggestions. . How to learn CAD design well{:1_90:}