--- Where was the park that the author described in his latest book?

---___ was near the zoo ___ we took many photos last month.

A．That, that

B．It, that

C．It, where

D．It, which

微束等离子弧焊接采用（）等离子弧。

A.直接型

B.转移型

C.非转移型

D.联合型