Perpendicularity - is the condition of a surface, axis, or line, which is 90 deg. From a datumplane 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
With the idea of the datumplane linking the two shops at a higher level, the shops are actually conceived as separate and independent entities on the ground.
基准面在更高的层层连接这两个商店的概念,而在地上作为单独的实体商店。
3
The present paper deals with the errors existent in routine datumplane statics under the condition of complex topography as well as the cause for the errors.