____ himself with necessary knowledge and skills, Tom went to the job market with much confidence.

A．Equipped

B．Equipping

C．Having equipped

D．Being equipped

铁素体耐热钢与其他黑色金属焊接时，焊后热处理的目的不对的是（）。

A.使焊接接头均匀化

B.提高塑性

C.提高硬度