the principal section; principal cross-section 主截面 the subjective case; nominative case 主格 ..
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The paper introduces the method and application procedure for the accurate measurement on highway cross-section by use of infrared ray instrument based on the principal of polar coordinates.
介绍一种根据极坐标原理和利用红外仪精确测量公路横断面的方法及实施步骤。
A formulation to analyse the large displacement problem of a Marine riser with two unequal principal moments of inertia of the cross section in the 3-d space is presented.
本文对截面具有两个不相等主惯性矩的海洋石油立管的三向大位移分析作了理论推导。
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