“flow-density relation”的概念、定义、翻译、参考文献-科学参考

单词	flow-density relation
释义	flow-density relation Encyclopedia 工学交通流模型释 flow-density relation流量密度关系流量与密度呈现抛物线关系，当密度为零，流量为零，密度逐渐增大到最佳密度，则流量增加到最大流量，随后密度逐渐增大，流量逐渐减小，密度达到阻塞密度时，流量为零。
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