The charging method of course series cannot be changed, that is to say, it is not supported to switch between "fixed charging" and "on-time charging", but it is supported to change the amounts of "fixed charging" and "on-time charging".

The latest version of Qian Chao app is a practical online education platform, and it is an online learning software similar to Litchi micro-class and micro-learning partner. Thousands of chat apps provide excellent online courses on the whole network to help you understand the relevant knowledge of all walks of life. Thousands of chat apps also have more than 60 functions such as live broadcast, recording, punching, exams, homework, and sign-in.