band mask meaning in Chinese

软韧橡胶面罩

Reference levels for narrow - band masking noise
窄带掩蔽噪声的基准级
Acoustics - reference zero for the calibration of audiometric equipment - reference levels for narrow - band masking noise
声学.测听设备的校准参照区.掩蔽噪声的参考等级
Acoustics - reference zero for the calibration of audiometric equipment - part 4 : reference levels for narrow - band masking noise
声学校准测听设备的基准零级第4部分：窄带掩蔽噪声的基准级
Acoustics . reference zero for the calibration of audiometric equipment . part 4 : reference levels for narrow - band masking noise
声学.听力测定仪器的校准用基准0 .第4部分:窄频带遮蔽噪声的基准级
Acoustics - reference zero for the calibration of audiometric equipment - part 4 : reference levels for narrow - band masking noise iso 389 - 4 : 1994 ; german version en iso 389 - 4 : 1998
声学.音响设备校正零点参考基准.第4部分:窄带遮敝噪