Guang 'an Examination

For the college entrance examination, if monitoring is installed, it costs more than 1000 yuan for one point, and thousands of dollars for the cheap ones. Everything is fixed except the front end and the background. If it is installed in the classroom, it will be permanent, so it won't. It will only carry some things that are convenient to move, such as signal jammers and signal interference sources, just like upstairs said.