近两年，到过永定河上游的人们会发现，没过护砌后的河岸被面整齐、美观、〔一幅美丽的图案．据悉，这里在国内首次使用了一种新型的混凝土联代板块进行护砌。目前，这种联销权已大士应用于北市布的永定河、期白河、通惠河、温榆河等6条河道工程的岸被护砌，铺设面积已达773万 In the past two years, people who have been to the upper reaches of the Yongding River will find that the river banks that have not been guarded are neat and beautiful, a beautiful picture. It is reported that here for the first time in China for the first time using a new type of concrete combined with the building blocks. At present, such joint-stock rights have been applied by Tuas to Yongding River in Beibu Cloth, and the shores of the 6 river courses including the Shibaihe River, Tonghui River and Wenyu River have been protected and the installed area has reached 77.3 million