excavator operation class: the semester lasts for one and a half months to learn the safe operation methods and maintenance techniques of excavators. Total cost: 3,96 yuan excavator comprehensive class: two months of semester, learning 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, hammer breaking, and towing cars up and down. Total cost: 475 yuan excavator maintenance class: three months of semester, learning the working principle of excavators and loaders, hydraulic, transmission, mechanical and circuit system maintenance technology. Total cost: 998 yuan loader operation class: one month of semester, learning the safe operation of loaders and maintenance techniques such as driving, structure and working principle. Total cost: 3,76 yuan car crane class: one month of semester, learning the safe operation, cargo lifting, maintenance and other technologies of car cranes. Total cost: 466 yuan. Roller operation class: one month of semester, learning the operation and structure, working principle and maintenance technology of roller. Total cost: 336 yuan bulldozer operation class: one month of semester, learning the safe operation and maintenance of bulldozers. Total cost: 346 yuan forklift class: one month of semester, learning the safe operation of forklift, cargo transfer and other maintenance technologies. Total cost: 3,16 yuan for tower crane operation class: one month of semester, learning the safe operation method and maintenance technology of tower crane. Total cost: 2,86 yuan. Construction project budgeter class: the semester lasts for three months, mainly studying drawing, building materials, construction structure, organization and management, budget and other technologies. Total cost: 398 yuan