高速切削塑性金属材料时，若没采取适当的断屑措施，则易形成（）切屑。
A.挤裂
B.崩碎
C.带状
D.短
参考答案：C
My parents__________ in Hong Kong. They were born there and have never lived anywhere else. [ ]
A. live
B. lived
C. were living
D. will live
在关系数据库设计中，设计视图(view)是哪个阶段的内容
A．需求分析
B．概念设计
C．逻辑设计
D．物理设计
