Acoustic sheds shall be provided to enclose the noise generating part of oscillators and drill-rigs to achieve at least 15dB(A) noise reduction.是什么意思_Acoustic sheds shall be provided to enclose the noise generating part of oscillators and drill-rigs to achieve at least 15dB(A) noise reduction.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句