— It's a fine day. Shall we go hiking?

— _____. Let's go.  [ ]

A. It's ok

B. Of course, you will 

C. That sounds good

D. No, thank you

压偏试验的目的是测定管子焊接接头的( )。

A．塑性

B．冲击韧度

C．抗拉强度

D．硬度