Questions 22 to 25 are based on the conversation you have just heard.

A．Some friends and relatives that she had no time to visit before.

B．The closest friends and relatives.

C．The friends and relatives that helped her a lot.

D．Some friends and relatives that would get upset if she doesn’t visit.

以下关于振动灌注桩的说法，正确的是( )。

A．适用范围广，除软土和新填土，其他各种土层均可适用
B．单振法、反插法和复振法三种方法产生的桩承载能力依次上升
C．振动灌注桩的承载力比同样条件的钻孔灌注桩高50%～80%
D．其施工方法是用落锤将桩管打入土中成孔，然后放入钢筋骨架，灌注混凝土，拔出桩管成桩