I'd rather not comment _____ their decision, for I'm not really familiar ______ what they do. [ ]

A. on; to

B. on; with

C. in; to

D. in; with

容器引蒸汽吹扫时，首先要脱水，目的是（）。

A、脱除杂质

B、防止水击

C、提高蒸汽温度

D、提高蒸汽压力