For example, Yao Yuan, a teacher who talks about mechatronics in Erjian, often says that we should summarize some good memory formulas for everyone in the future. But the course is over, and I haven't seen the formula of memory yet.
There are still many mistakes during the lecture, even the double cross arm and single cross arm of the telephone pole are not clear; It is also said that the height greater than 100 meters is a high-rise building.