For example, in view of the specific problems in your paper, why did you do this?

When some questions in the paper are not thoroughly elaborated, you may be asked for specific parameters or basis … and so on.

You can also start a paper and ask some related or similar questions to examine your knowledge.

You can also ask some knowledge that seems irrelevant to the paper, but belongs to the knowledge that CNC technicians should master.

The correct countermeasures are: first, we should memorize our own papers, which problems are expounded and which theories are cited. What tests or production verification did the paper pass? Can others fully understand this problem after reading the paper, and can your paper guide others to solve the problem? What other questions might others ask? These should be psychologically prepared and be able to answer questions like flowing water.

Then according to the relevant requirements of the national professional skill appraisal "CNC technician", enrich and consolidate their knowledge and skills.