What suggestions do you have for the study and teaching of photography technology?

1, intersecting line: demonstrate the changing law of intersecting line with cylinder diameter step by step with multimedia animation. 2. Synchronous teaching of mechanical drawing and CAD drawing 3. Dissolve or participate in the competition 4. In the course of mechanical drawing, it is difficult for students to learn early because their spatial imagination can't keep up. Teachers must encourage them more, speak wrong questions in a unified way and correct them separately. Never tell the answers, let students think for themselves and slowly cultivate fun.