The structure formulas of PAH are tabled in accordance with the characteristic Numbers proposed by one of the present authors.
PAH的结构式皆以作者之一所提出的特征数表征。
They have the same number of protons in their nuclei (this is the defining characteristic of an element), but different Numbers of neutrons.
在它们的原子核中质子数是相同的(这是一个元素定义性的特征)，但是中子的数量不同。
The relations between dielectric, Numbers of circles and the characteristic parameters of the helical line were studied.
通过实验研究了充电介质、螺旋匝数及形成线结构与螺旋脉冲形成线特性参量间的数值关系。
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