进度计划按其表现形式划分可分为（）。
A.项目总体控制计划
B.单项或单位工程进度计划
C.横道图
D.垂直图
E.网络图
参考答案：A, B
If you try to understand _____ that prevents so many Americans from being as happy as one might expect,
it seems that there are two causes. [ ]
A. what it does
B. why it is
C. why it does
D. what it is
关于侧隐窝的描述
错误
A．是椎管的狭窄部位B．前壁为椎体的后外侧面C．后壁为钩突D．外侧壁为椎弓根的内侧面E．内有神经根通过
