有规律的重复活动如声波、光波、无线电波都有一个特定的频率，或者说是每秒的波动次数。
Regular repeating actions such as sound waves, light waves, or radio waves have a certain frequency, or number of waves per second.
测量系统的重复性和再现性（R&R）变异是测量值波动的一个重要来源，它对于控制图的性能会造成影响。
The repeatability and reproducibility variation of measurement systems is a major source of differences of measurement data fluctuation, and influences the performance of control charts.
充型速度可以根据设定值精确重复再现，不受炉内泄漏和管路气压波动的影响。
The speed of full mould can be repeated accurately on the basis of given parameter values, and is not influenced by leaking in furnace and pressure fluctuating.
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