抢护漏洞的软帘盖堵法适用于洞口附近（），土质松软或周围已有许多裂缝的情况。
A.流速大
B.水浅
C.水较深
D.流速小
参考答案：D
After the party, the boy apologized to the girl for the trick he had _____ on her. [ ]
A. taken
B. played
C. undertaken
D. conducted
催产和引产可选用
A．缩宫素B．麦角新碱C．糖皮质激素D．维生素KE．麦角胺
