A.穩(wěn)定計(jì)算 B.防滲計(jì)算 C.參照已建壩經(jīng)驗(yàn) D.a和b
A.20%~25% B.15%~20% C.18%~22% D.23%~28%
A.大于320mm B.小于300mm C.大于300mm D.小于320mm