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See Chinese contents: GB/T 39015.2-2020 GB/T 39015.2-2020: Road vehicles--Interchangeability of mechanical couplings between tractors and semi-trailers--Part 2: Low-coupling tractors and high-volume semi-trailers
This Part of GB/T 39015 specifies interchangeability size, control size and marks of interchangeability of mechanical couplings between tractors and semitrailers. This Part is applicable to two-axle semi-trailer tractors and matching semitrailers.
