【Key words】 Electronics level； Coding rod； Metrology； Calibration rules； Double-frequency laser interferometer； System accuracy；
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General rules for calibration system 校正系统的一般规则
The rules of the road would be a result of this careful calibration, tested constantly by the forces of supply and demand.
道路规则可能就是这种仔细衡量的结果，并不断受到供需力量的测试。
It also introduces the rules of choosing the calibration area and erecting the radiating and receiving antennas.
同时，还介绍了校准场地的选择和收发天线架设的原则。
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