A unit vector normal to the plane of t and n, which is the plane of curvature.
所构成的平面的单位向量，该平面为曲率所在的面。
2
In order to produce n pentane desorbing agent for molecular sieve dewaxing unit, the refining tests for reformed n pentane oil were carried out by using complexing agents.
The paper introduces the design and application of perforated weir-riser distributor with toothed weir, which is used in the modification of n-paraffin separation unit.