作为一个ABS系统必须遵守大量的非常复杂的必要条件：在轮胎与地面间最大限度的利用滑移系数。
Such an ABS system must comply with a number of extremely complex requirements: maximum utilization of the coefficient of slip between tires and road.
欧共体反倾销法的一个显著特点就是将“共同体利益”作为考虑反倾销措施的必要条件。
One of outstanding characteristics of European Community antidump goods law is that "community interest" is regarded as the indispensable condition in considering antidump goods measures.
本文引入并研究了叶层结构的定向性，作为应用，讨论了李群在流形上的自由作用，给出了存在李群自由作用的一个必要条件。
In this paper, the orientability of foliations was investigated, and an application to the free action of Lie groups on manifolds was given as well.
本文引入并研究了叶层结构的定向性，作为应用，讨论了李群在流形上的自由作用，给出了存在李群自由作用的一个必要条件。
In this paper, the orientability of foliations was investigated, and an application to the free action of Lie groups on manifolds was given as well.
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