It is found that scaling exponent equal to 2 is a typical cutoff of scaling exponent for scale-free networks.
研究表明，度分布指数等于2是无标度网络中度分布指数的一个临界值。
Recently, the discussion on allometric model becomes a hotspot again, with the focus on the scaling exponent and theoretical explanation.
最近，关于异速生长模型的讨论再次成为焦点，讨论热点为异速生长指数的取值及其理论解释。
RESULTS:The scaling exponent of the cardiovascular system, which is deduced with the dimensional method, is consistent with those published in articles.
结果：使用本文提出的理论方法所得结果与资料实验数据基本一致。
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