所有权制度与所有制有密切的关系，所有制是生产关系的基础和核心，所有权制度是所有制形式在法律上的表现。()
参考答案：对
— I'm sure Andrew will win the first prize in the final.
— I think so. He ______ for it for months. [ ]
A. is preparing
B. was preparing
C. has been preparing
D. had been preparing
机件向基本投影面投射得到的视图称为（）。
