Dimensioning issues in mechanical parts drawings

This kind of problem cannot be solved by rote memorization, but by long-term practice and observation!

The premise of "When marking the dimensions of part drawings, the processing technology should be the main focus" is completely correct. Since many designers have little practice in processing, this is a very head-scratching problem, and it is very difficult for novices to figure it out. It’s difficult to solve, and it’s also one of the places where jokes are often made!