单位施工组织设计的核心内容是( )。
A．准备施工计划 B．施工方案C．进度计划 D．施工平面布置图
参考答案：B
A．5m/s
B．10m/s
C．12.5m/s
D．62.5m/s
The telephone in the office is not available, it _____ somehow this morning. [ ]
A. broke away
B. broke out
C. broke up
D. broke down
