这个基本概念在大多数水力学教科书中已有介绍.This basic concept is illustrated in most texts on hyd aulics.根据水力学原理设计的泵体,噪声最小.According to the design of water pump body mechanics the smallest noise.因而,本论文在河道汇流上采用水文学与水力学相结合的方法.Accordingly the co...
Ninety per cent of lone parent families are headed by mothers.90%的单亲家庭由母亲持家。a lone sailor crossing the Atlantic独自横渡大西洋的人A lone sea gull flew across the sky.一只孤独的海鸥在空中飞过....