A.7d B.14d C.25d D.28d
A.持力層越硬,樁土相對剛度越大 B.持力層越硬,樁土相對剛度越小 C.持力層越軟,樁土相對剛度越大 D.持力層越軟,樁土相對剛度越小
A.1% B.2% C.3% D.4%