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Reverberation room is the special test room that is used in acoustics, in the measurement of sound absorption coefficient in random incidence and determination of sound power levels of noise sources, the reverberation room is used very extensively. 摘要混响室是声学专业的实验室用房，它在测量声波无规入射时材料的吸声系数和测量噪声源的声功率级中得到了广泛应用。
Method of sound power levels of noise emitted by household sewing machine head 家用缝纫机机头噪声声功率级的测试方法
Engineering method for the determination of sound power levels of noise sources using sound intensity 根据声音强度测定噪声源声功率级的工程方法
Engineering methods for the determination of sound power levels of noise sources in a special reverberation test room 在混响室里用工程方法测定噪声源声功率级
Acoustics - Determination of sound power levels of noise sources - Guidelines for the use of basic standards 声学。噪声源的声级测定。基础标准使用导则
Determination of sound power levels of noise emitted by metal cutting machine tools 金属切削机床噪声声功率级的测定
Precision methods for the determination of sound power levels of noise sources in anechoic and hemi-anechoic rooms 在无回声和半无回声的室内测定噪声源声功率级
Engineering Methods for the Determination of Sound Power Levels of Noise Sources for Essentially Free-Field Conditions over a Reflecting Plane 反射平面上实质自由场条件下噪声源的声功率级的工程测定法
Acoustics - Determination of sound power levels of noise sources using sound intensity - Precision method for measurement by scanning 声学。利用声强度对噪声源声功率级别的测定。使用扫描精确测量法
The level of noise in Anqing Textile Factory exceeded the Criteria of National Occupational Hygiene 85dB(A). 安庆市纺织厂女工的职业噪声暴露平均水平超出国家职业卫生标准85dB(A)。
Measure the level of noise with the SafeZone indicator, calculate its 22-day EMA, and translate that into dollars. 使用安全区域指标度量波动水平，计算出其22日均线，并将结果化为金额。
One coal mine gas plant with an electrical power level of 1.35 MW avoids approximately 45,000 tonnes of CO2 emissions each year. 一台发电功率为1.;35兆瓦的矿井瓦斯设备每年能减少约45;000吨CO2的排放。
She made a lot of noise about the poor food. 她高声抱怨食物太差。
The transformer is designed for a power level of 350 kW and is realized with amorphous core material and coaxialwindings . 该变压器是按350kW的功率级设计的,并且用无定形铁心材料和同轴绕组制成。
The rising level of crime is a sign of the times. 犯罪率增高是这一时代的特徵。
The dentist's drill made a lot of noise. 牙钻发出很大的噪音。
This article provide two programs which can get the second negative output from the power level of a main low-dropout regulator. 本文给出了两种从一个主降压稳压器的功率级得出一个第二负输出的方案,这两种方案具有广泛的实用价值。
The topology satisfies the requirement of galvanic isolation and greatly increases the power level of single-stage PFC converter. 该变换器能满足电气隔离的应用要求，提升单级隔离型PFC的功率等级。
The level of inflation has gone beyond 8%. 通货膨胀率已经超过了8%。
Such an ensemble average can reduce the level of the instabilities originating from individual pulsar and other sources of noise. 采用合适的长期稳定度算法，由多颗毫秒脉冲星计时观测可以建立综合脉冲星时间尺度。