... 梯形断面活塞环 keystone piston ring 梯形断面排水沟 channel with trapezoidal section 侧断层 lateral shear ...
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There have been several approximate solutions for critical depth of a channel with trapezoidal section, and some of them are satisfactory.
梯形明渠临界水深的近似解法已有多种，渐趋成熟。
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