A.10% B.5% C.15% D.20%
A.D卷≥14d繩 B.D卷≥(16~20)d繩 C.D卷≥16d繩 D.D卷≥25d繩
A.D滑〉14d繩 B.D滑〉18d繩 C.D滑〉16d繩 D.D滑〉20d繩