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- frequency secondary standard 二次频率标准
- From 2002 to 2004, the quality of ambient air in urban area of Qinzhou city reach national secondary standard. 摘要2002年至2004年，钦州市区环境空气质量达国家二级标准。
- A working standard (i. E., In-house or secondary standard) is a standard that is qualified against and used instead of the reference standard. 工作对照品(也就是内部标准品或二级标准品)是根据一级对照品标定的,并用来代替一级对照品的。
- crystal-controlled secondary standard frequency measuring equipment 晶体控制次级频率标准测试装置
- National Secondary Standard of Fatness Machine 平面度副基准装置
- secondary standard reference surface 二极标准磁盘面
- Research on national secondary standard and harmonic standard of industrial frequency three-phase electric energy metrology 工频三相电能国家计量副基准和谐波计量标准的研究
- The Use of Tungsten Filament Lamps as Secondary Standard Sources 作为第二标准来源使用的钨丝灯
- secondary standard protection level x-ray dose ratemeter 第二标准防护能级X线剂量率计
- secondary standard therapy level x-ray exposure meter 第二标准治疗能级X线曝光表
- He varied the transmission frequency. 他变换了无线电传送的频率。
- A unit of frequency equal to one cycle per second. 赫兹频率的单位，等于每秒一周
- National secondary standards of temperature device 温度副基准
- Fatal accidents have decreased in frequency over recent years. 近年来死亡事故发生的频率已经下降。
- Influence of air buoyancy in comparing of Kilogram secondary standard weights 公斤副基准砝码比对中空气浮力的影响
- We can often correlate age with frequency of illness. 年龄的大小往往与发病率有关。
- Accidents on that highway are happening with increasing frequency. 那条高速公路上车祸发生得越来越频繁。
- He tuned his radio to the police frequency. 他把无线电调到警方的频率。
- Comparison of the secondary standard hematology analyzer-based method versus reference method 二级标准检测系统测定红细胞比积与参考方法检测结果的比较
- He manipulated the frequency dial of the radio. 他开始调拨频率键盘。
- 今日热词
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- 深远海浮式风电平台 - deep-sea floating wind power platform
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- 京雄高速公路 - Beijing-Xiongan expressway
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- 农业及相关产业增加值 - the added value of agriculture and related industries
