在变形缝中沉降缝的突出特点是( )。
A．屋顶断开B．楼板、墙身断开C．基础断开D．从屋顶到基础一断到底
参考答案：D
（）属于软件详细设计阶段的任务。
A．算法设计
B．功能设计
C．调用关系设计
D．输入/输出设计
Email, as well as telephones, ________an important part in daily communication.[ ]
A. is playing
B. have played
C. are playing
D. play
