1. Excavator operation course: one month of semester, learning the safe operation method and maintenance technology of excavators. Total cost: 3680 yuan. Sogou asked 2. Comprehensive excavator class: one and a half months' semester, to learn the safe operation of excavators of world brands such as Carter, Volvo, Komatsu, Hitachi, Sumitomo, Kobelco, Hyundai and Daewoo, as well as the maintenance techniques such as long arm operation, river dredging, breaking hammer and lifting tractor. Total cost: 4460 yuan.

3. excavator maintenance class: the semester lasts for three months, learning the working principle of excavators and loaders, and the maintenance technology of hydraulic, transmission, mechanical and circuit systems. Total cost: 9980 yuan.