制图里表达零件外部形状的方法是()。
A、视图
B、剖视
C、剖面
D、三视图
参考答案:A
The loss has not yet been _____ accurately, but it is believed to be well beyond a hundred million dollars. [ ]
A. calculated
B. considered
C. completed
D. controlled
数据库三级模式体系结构的划分,有利于保持数据库的 【4】 。