保持地位战略新产品开发采用( )。
A.自行研发或合作研发
B.自行开发或委托开发
C.自行开发或引进开发
D.自行研发、引进开发、合作开发
参考答案:C
改错。
( )1. My favourite colour are red. ______
A B C
( )2. I don't like tigers but they don't like me. ______
( )3. Does you like skipping, Lingling? ______
( )4. Pass me one rice, please. ______
( )5. Amy don't like oranges. What about you? ______
()工作时,缸套和活塞有极少量的泥浆漏失是正常的。