— Bob, how about having a picnic this weekend?

— _________. I'll check my schedule. [ ]

A. Sounds great fun.

B. Good idea.

C. I'm not sure.

D. Well done.

点状加热的火焰矫形法主要用于（）的矫形。

A.薄板结构

B.厚板结构

C.收缩变形

D.弯曲变形