文书工作的每道程序和手续，都有各自的规范和技术要求，不可以有（）。
A.偏重性
B.重点性
C.随便性
D.随意性
参考答案：D
Arriving late, he quietly sat at the back,______ his book and began to write. [ ]
A. took off
B. took out
C. took away
D. took down
Access中的“表”指的是关系模型中的( )。
A) 关系 B) 元组 C) 属性 D) 域
