A. 沉小型桩、钢板桩 B. 沉重型的混凝土桩、钢桩 C. 沉混凝土桩、钢管桩 D. 沉木桩和断面较小混凝土桩
At a movie theatre. B. At a supermarket. C. At a cafeteria. D. At a laundromat.