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See Chinese contents: GB/T 14097-2023 GB/T 14097-2023: Reciprocating internal combustion engines - Limit values of emitted noise
This document specifies the five grades of sound power level limits of noise for reciprocating internal combustion engines. This document applies to reciprocating internal combustion engines defined in GB/T 21404 (hereinafter referred to as and quot;engines and quot; unless otherwise specified).
