重力式码头棱体抛填前应检查基床和岸坡有无()，必要时应进行清理。
A.冲刷
B.沉积
C.回淤
D.塌坡
E.塌陷
参考答案：C, D
The crude oil overflowed from measuring-hole due to（）the valve of No.1 tank.
A.not close
B.not closing
C.not have closed
D.no closing
武术散打学习中都有哪些礼节？
