--- Mary, where do you work?

--- I work in a company _____ sells clothes.

A．where

B．what

C．who

D．which

若炉管是从内部减薄，可以判断是由于（）造成。

A.高温硫腐蚀

B.高温氧化

C.应力腐蚀

D.硫化氢腐蚀