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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
价格：￥0.00
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声学 声压法测定噪声源 声功率级 反射面上方采用包络测量表面的简易法
Acoustics--Determination of sound power levels of noise sources using sound pressure--Survey method using an enveloping measurement surface over a reflecting plane
价格：￥0.00
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声学 声压法测定噪声源声功率级 反射面上方近似自由场的工程法
Acoustics--Determination of sound power levels of noise sources using sound pressure--Engineering method in an essentially free field over a reflecting plane
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声学 水听器低频校准方法
Acoustics--Low frequency calibration methods of hydrophones
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声学 用于声功率级测定的标准声源的性能与校准要求
Acoustics-Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels
价格：￥0.00
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声学 1～10MHz频率范围内橡胶和塑料纵波声速与衰减系数的测量方法
Acoustics-Methods for measuring the longitudinal sound speed and attenuation coefficient of rubbers and plastics in the frequency range 1MHz to 10MHz
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声学 隔声罩的隔声性能测定 第2部分;现场测量(验收和验证用)
Acoustics--Determination of sound insulation performances of enclosures Part 2: Measurements in situ (for acceptance and verification purposes)
价格：￥0.00
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声学 隔声罩的隔声性能测定 第1部分;实验室条件下测量(标示用)
Acoustics--Determination of sound insulation Performances of enclosures Part 1: Measurements under laboratory conditions (for Declaration purposes)
价格：￥0.00
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声学 阻抗管中吸声系数和声阻抗的测量 第2部分;传递函数法
Acoustics--Determination of sound absorption coefficient and impedance in impedance tubes Part 2: Transfer function method
价格：￥0.00
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声学 医用体外压力脉冲碎石机声场特性及其测量
价格：￥0.00
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