standard frequency

According to basic values of ISO standard evaluation of audiometric environment noise by using A-weighted sound level meter is proposed. Different audiometric contents and various frequency ranges are analyzed.

根据ISO标准的基本数值，提出了用A-计权声级评价测听环境允许噪声，分析了不同测听内容和各种测听频率范围的噪声特征。

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Automatic Measurement System for Non-Integral Frequency Standard

非整数频标自动测量系统

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Axis intersection, which is required in large-diameter reflector frames and frequency doubling crystal framework of SG-ⅲ range of PV systems, three-axle table, precision centrifuge and some machine tools, is an important precision standard.

轴线相交度是一种重要的精度指标，在神光-Ⅲ靶场光电系统的大口径的反射镜架及倍频晶体框架、三轴仿真转台、精密离心机和某些机床中对其大小都有一定的要求。

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Research shows that the intrinsic frequency of hole defect lumbers is little lower than standard lumbers.

研究表明,含有孔洞试件的固有频率与标准试件相比略低一些,但差别不大.

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The frequency should takeintoaccountmany parameters including disease types and stages, treatment periodicity and standard practice.

确定随访频率时要考虑许多参数,如疾病类型、分期 、 治疗周期和标准操作等.

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The atomic hydrogen maser is the most stable frequency standard allshortest measuring time interval.

氢脉泽是一种中、长期稳定度最高的原子频率标准.

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High precision quartz oscillators were used for the transmission of BPV standard frequency and time signals at Shanghai Observatory.

在上海天文台BPV标频和时间信号的发播工作中，使用了高精度石英晶体振荡器。

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According to the national standard test methods, the frequency response of winding deformation curve was obtained through testing and analyzing the transformer winding model.

参照国家标准的测试方法，对变压器绕组模型进行了测试、分析，得到了绕组变形的频率响应特性曲线。

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Ensuring the Standard Frequency of Carbody Bending Vibration of EMUs.

电动车组车体弯曲振动标准频率的保证.

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The basic GPR principle, the detection equipment to be adopted, the detection basis, frequency and testing line layout for general detection content, the radar parameters setting standard, the procedures of detection and data processing will be described.

将介绍探地雷达的基本原理和拟采用的检测设备，隧道质量常规项目的检测依据、频率与测线布置，雷达参数的设定准则，检测步骤与数据处理过程。

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Approaching how to distinguish outlier from different parameter estimation methods. And used this standard ( large than EX+ 3 x σ X) to estimate the design sub stage maximum tidal levels using the frequency analysis.

探讨了不同参数估计方法下如何判别特大值，并用得到的判别标准（大于EX+3×σX）对修正后的分期最高潮位序列进行频率分析确定了分期设计最高潮位。

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