如下图所示的渗透试验装置,水平的圆形截面容器内装有黏土和砂土,长度分别为L1和L2。如果A、B两容器水面保持不变,水自左向右渗透过土样,总水头损失为Δh,黏土和砂土的水头损失分别为Δh1和Δh2。若黏土和砂土的渗透系数分别为k1和k2,则两者的比值k1/ k2为( )。
Solon established a council of _____ members drawn from all four classes and gave citizens the right of appeal.
The Storming of the Bastille marked the outbreak of the Revolution. Today the Bastille Day is the national day of France.
In 1477 Burgundy was defeated by the Swiss army, the last duke was killed, then_____annexed most of the land of Burgundy.