我国历史上存在时间最长的是哪个朝代?()
A.清朝
B.明朝
C.周朝
参考答案:C
_____ you keep on trying, I really don’t mind whether you can come up top in your class.
A.As long as
B.Even though
C.As soon as
D.The moment
使用PowerDesigner的Data Architect可以对数据库生成物理数据模型(PDM),这种功能通常称为【 】。