• 1. arbitrarily assigned: 随意性地制定

• 1.Two primary standard reference fuels, normal heptane and iso-octane arbitrarily assigned 0 and 100 octane number, respectively, are then blended to produce the same knock intensity as the test sample.
  两种基准参考燃料正庚烷和异辛烷分别被定义成辛烷值为0和辛烷值为100，将它们混合产生与实验样本相等敲缸强度的爆震。
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• 2.A sufficient condition that characteristic exponent can be assigned arbitrarily for linear periodic system is also attained in the paper.
  文章还给出了一个线性周期系统特征指数可以任意配置的充分条件。
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• 3.The observers thus designed have minimal order and their poles may be assigned arbitrarily.
  用此法设计的观测器具有最低动态阶数，且极点可以任意配置。
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