Standards of maintenance and repair of motor vehicles refer to certain operating conditions. called reference. They are designed for full or partial combination of the following conditions: I category of operating conditions; basic models of buses; the enterprises performed maintenance and repair of 200-300 units of rolling stock; mileage from the beginning of operation is 50-70% of t... https://www.hcbcyouthleadersummit.com/product-category/vitamin-b-12/