弧形坡脚梯形渠道实用经济断面计算公式的改进及计算结果的修正
호형파각제형거도실용경제단면계산공식적개진급계산결과적수정
On Modification of Calculation Formula of Practically Economic Cross-section of Trapezoidal Channel with Curved Slop Toe and Renwal of Calculation Result
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