按桩的使用功能分类,桩可分为().
A﹒水平受荷桩
B﹒竖向抗压桩
C﹒竖向抗拔桩
D﹒复合受荷桩
E﹒部分挤土桩

A. ensure
B. stay
C. struggle
D. suffer

A. at
B. to
C. of
D. for

A. focuses
B. acts
C. depends
D. insists