火星没更海洋,没更海平面,地势起伏, 因此,火星的基准面(datum surface)是人为规定的。基准面是火星地表大气压 为6.107百帕的高度,在概念上与地球以一大气压(1013百帕)为海平面高度类 似。
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common datum surface 公有基准面
Datum Surface Locator 基准面定位器
surface reference datum 地面参考基准面
datum of level surface 水准面基准
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。
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。
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