为加强堤坝边坡抗冲刷能力，一般是利用漂浮物来消减风浪冲击力，或在堤坝坡受冲刷的范围内做防浪护坡工程。
参考答案：对
– James didn’t ____ last night, did he?
– No. He ____. We had changed our plan.
A．turn away; shouldn’t have come
B．turn up; needn’t have come
C．turn up; didn’t need to come
D．turn away; doesn’t need to come
组织效率的高低是领导工作好坏的重要标志。
