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。

youdao

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.

为了生产用于分子筛脱蜡装置的正戊烷脱附剂，利用络合化学试剂对切割分离后的重整正戊烷油进行了脱烯烃精制实验。

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The problem is to determine the optimal replacement policy ( N , T )? such that the long-run expected cost per unit time is minimized.

利用几何过程，以系统大修次数N和大修时间间隔T为更换策略，选择最优策略（ N ， T）使系统经长期运行单位时间的期望费用最小。

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The infiltrators fled the scene after the A.U.-U.N. police unit returned fire, the mission said.

CNN: STORY HIGHLIGHTS

Milosevic remained in the U.N. detention unit in Scheveningen outside The Hague, and was not in the courtroom.

CNN: Lawyers demand Milosevic's freedom

In 2009, a weak market forced Toll to cut prices by 25% on three-bedroom units at its massive 450-unit Northside Piers in Brooklyn, N.

WSJ: Toll Brothers Goes Condo