知识产权的特征有( )。
A.知识产权客体的无形性
B.某些知识产权具有财产权和人身权的双重性
C.依法审查确认性
D.地域性和时间性
E.客观性和科学性
参考答案:A,B,C,E
As a businessman he was a success,but as a husband he was _____ failure, so their marriage ended in _____
failure. [ ]
A. /; /
B. /; a
C. a; a
D. a; /
钢在淬火时能够获得马氏体的能力称为(),它是钢材本身固有的属性。
A、钢的淬硬性;
B、钢的淬透性;
C、奥氏体的稳定性;
D、钢的硬脆性;