—Can you guess ______ the new schoolbag yesterday?

—Sorry, I’ve no idea.

A．how much did he pay for

B．how much he spent

C．how much he paid for

D．how much did he spend

企业知识产权价值评估不具有哪个特点( )

A．估价性

B．时效性

C．针对性

D．强制性