The connection can be made by using the running surface of the paved cart as the horizontal datum.
连接时可以利用已铺好的大车运行轨道面作为水平基准。
Surface should be used as a fine datum to be processed first, because the precision of the positioning of the surface is more accurate, the smaller the clamping error is.
用作精基准的表面应先加工出来，因为定位其准的表面越精确，装夹误差就越小。
A method for deriving the smoothed ground surface from CMP datum of static correction is given to form a common datum for velocity spectrum, time-depth conversion and depth migration in depth domain.
本文还给出了根据（静校正的）CMP基准面计算地表圆滑面的方法，统一了深度域中速度谱、时深转换和深度偏移的基准面。
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