Because the surface of the water table is not flat but instead rises and falls with topography, groundwater is affected by gravity in the same fashion as surface water.
由于地下水位不是平面的，而是随着地形起伏的，所以地下水和地表水一样受到重力的影响。
2
These types of equipment are basically comprised of inclined trough separator, oscillating table, spiral separator and centrifugal gravity separator.
这类设备主要包括斜槽分选机、摇床、螺旋分选机和离心重力分选机。
3
The results for the centre of gravity position and principal axes are presented relative to the surface of the moving table.