我国专利权客体不包括( )。
A.外观设计
B.注册商标
C.发明
D.实用新型
参考答案:B
Thomas Edison often enjoyed ______ strange questions and ______ out good ideas
when he was a child. [ ]
A. to ask; trying
B. to ask; to try
C. asking; to try
D. asking; trying
汽车驱动力受附着力的限制,附着力越大,驱动力()。