Backwater is a main influential factor of the effective cavity length, almost a decisive one sometimes.
空腔回水是制约有效空腔长度的一个主要因素，有时甚至是决定性因素。
In comparison with the condition of rigid connection, the influence of semi-rigid connection to effective length factor of columns has been analyzed quantitatively.
通过与刚性连接情况的比较，定量的分析了半刚性连接对框架柱计算长度的影响。
A new concept of the control structure of the LAN is proposed primarily. And the concepts of effective and viewing bit length and bit length factor are proposed.
本文初步提出了局部网络的控制结构概念，以及有效位长度，无效位长度、视在位长度、位长度因素等概念。
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