1·Perpendicularity - is the condition of a surface, axis, or line, which is 90 deg. From a datum plane or a datum axis.
垂直度-条件是表面，轴，或线，这是90度的基准平面或基准轴。
2·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。
3·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。
4·The precondition of RG line being as datum of time-depth conversion is that the RG line is equivalent to the smooth line of surface elevation.
RG线作为时深转换基准面的前提是RG线等效于地表高程的平滑线。
5·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。
6·In this paper, the observed land surface height data and tidal data in the Yellow River delta foreland area are used to describe the variations in depth datum and tidal level in the area.
通过黄河三角洲前沿陆地高程的变化和验潮获得的资料，介绍了黄河三角洲前沿深度基准面的变化和潮位变化情况。
7·The choice precision is high, the installment stable reliable surface is the fine datum.
选择精度高、安装稳定可靠表面为精基准。
8·Thick datum choice: Has the non-processing surface, the elected non-processing surface takes the thick datum.
粗基准选择：有非加工表面，应选非加工表面作为粗基准。
9·In migration processing, we usually require that migration datum is horizontal and that zero point for migration should be on the ground surface on which shot point and receiving points lie.
在作偏移处理时，一般要求偏移基准面是水平的，且偏移的零点应在激发和接收的地表。
10·If the element being tested with a tolerance requirement is a contour line or surface, point the arrow and datum symbol to the contour line or surface, and keep it away from the dimension line.
当具有公差要求的被测要素为线或平面时，将指引线箭头和基准符号指在线或平面上，且必须与尺寸线错开。