Select planar surface or datum plane.

任意选择一个平面。

The datum plane of system is made certain and its veracity is proven by experiment.

确立了检测系统的基准，并就系统基准的准确性进行了验证实验。

With the rise and fall of datum plane, sedimentary centre of sand stone moved towards sediments source or basin.

并且随基准面上升和下降，砂岩沉积中心分别向物源和盆地方向迁移。

It introduces the perspective system feature in different positions between tableau and datum plane inclination.

研究了画面与基面处于不同位置时的透视体系特征。

However, similar characteristics of deep karst below the present drainage datum plane are less studied up to now.

现代排泄基准面以下深岩溶的类似特征则至今研究尚少。