GB/T 1859.4-2017往复式内燃机声压法声功率级的测定第4部分:使用标准声源简易法国家标准
英文:Reciprocating internal combustion engines—Measurement of sound power levels using sound pressure—Part 4:Survey method...
英文:Reciprocating internal combustion engines—Measurement of sound power levels using sound pressure—Part 4:Survey method...