中国旅游业的图形标志“马超龙雀”出土于()。
A.武威
B.敦煌
C.玉门
D.酒泉
参考答案:A
_____ for the timely investment from the public, our company would not be so booming now. [ ]
A. Had it not been
B. were it not
C. If it was not
D. Be it not
在数据库的3级模式结构中,外模式又称为
A.物理模式
B.存储模式
C.逻辑模式
D.用户模式