等比级数;
According to principles of economy, the seepage control effectiveness of canals which is studied under static and dynamic conditions and with arithmetic and geometric progression of seepage control performance to time as well as with no change seepage control performance to time is studied.
依据经济学原理,对混凝土渠道在经济静态和动态条件下,防渗性能随运行时间呈等差衰减、等比衰减及不随运行时间衰减时的防渗效益进行了研究。
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