均质土坝最常用的土料有______。
A.砂质黏土
B.黏土
C.细砂
D.壤土
E.砂砾石
参考答案:A,E
An original mechanism to deal with conflicts is established in order to prevent overspilling of conflicts from one country into another country.
上下级保护间只要动作时间配合好,就可以保证选择性