Determining optimal space and depth of the subsurface plastic drainage tubes is a main task in planning and design of a drainage system. 农田塑料暗管埋深和间距的确定，是塑料暗管排水系统规划设计的主要任务，关系到排水效果和投资效益。
Apatite fission track data suggest that the early Cretaceous strata in the Liupanshan basin were subjected to two burial heating events. 磷灰石裂变径迹研究表明，六盘山盆地白垩系地层经历两次埋深加热事件。
