_______
A. Dept=DS
B. Dept=DS WITH CHECK OPTl0N
C. Dept='DS'
Dept='DS' WITH CHECK OPTIoN
_____
A. 基类
B. 派生类
C. 基本类型
D. 用户定义类型
____
A. +1
B. -215
C. -1
D. -216
"It stands to reason" in the paragraph means"______".
A. Everyone finds it hard to believe
B. It is obvious to everyone
C. Everyone knows the reason
D. Nobody believes it