UNIX文件的存取权限包括以下哪几类用户的权限:()
A.informix
B.owner
C.tellin
D.group
E.other
参考答案:B, D, E
The tables in the restaurant are so close together that there's hardly any room to move ___ them. [ ]
A. among
B. between
C. in the middle of
D. at the centre of
床层的运动状态决定矿粒按重量分层的效果。