Engineering system of sluices and river
中国大运河技术史

        Continuous sluices are multiple sluices built in the canal.When the HuitongCanal was excavated in 13th century,20 sluices were constructed on it.Lateron the number of the sluices were increased to 40.In the Qing Dynasty,there were 48 sluices on the Huiton    （共 3947 字）     [阅读本文] >>