—What was Jim wearing at the party?

—Nothing      . He was in his usual shirt and jeans.

A. special           B. simple              C. important

如怀疑压力表失灵，最可靠的办法是（），就可以判定压力表是否失效。

A、关闭引出阀，再打开，看压力表是否回零

B、更换几个新压力表，进行数值对比

C、将该压力表卸下再装上，进行数值对比

D、更换压力表垫片，进行数值对比