挡土墙排水处理措施常用（）等。
A、地面封闭处理
B、墙后土坡排水
C、泄水孔
D、墙后截水明沟
参考答案：A, B, C, D
He was educated at the local high school, ______ he went on to Beijing University.
A．after which
B．after that
C．in which
D．in that
急性血源性骨髓炎早期局部穿刺的正确方法是
A．一次穿入骨髓腔B．一次穿入骨膜下C．逐层穿刺D．不可穿入骨髓内E．仅刺入软组织即可
