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。
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。
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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