The ability _________ an idea is as important as the idea itself.

A．expressing

B．expressed

C．to express

D．to be expressed

铅衬里的固定方法有搪钉固定法、( )、压板固定法(焊接式)等。

A．封闭衬里

B．上铅衬里

C．粘贴衬里

D．螺栓固定法