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See Chinese contents: GB/T 40578-2021 GB/T 40578-2021: Measurement methods for noise emitted by light-duty vehicles in multiple driving mode conditions
This Standard specifies measuring instruments, measurement conditions, test requirements for measurement methods for noise emitted by light-duty vehicles in multiple driving mode conditions. This Standard is applicable to measurement of noise emitted by M1 category, M2 category and N1 category vehicles with the maximum design total mass not exceeding 3500kg in multiple driving mode conditions.
