Unfortunately the section doesn't really cover the breadth of these issues directly or by providing references.
不幸的是，这一节并没有真正涵盖这些问题的广度或者提供参考资料。
It is shown that the optimal hydraulic section for compound canal has smaller section area and narrower breadth of water surface than trapezoidal canal by calculation and comparison.
并通过算例比较证实，复合断面水力最佳断面的面积和水面宽度比梯形水力最佳断面的小。
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