The pale face of my friend suggested that he ______ in poor health, and I suggested that he ______ to see a doctor.

A．is; went

B．was; goes

C．should be; go

D．was; go

透平排凝阀排净后再关闭（）及相关阀门

A.蒸汽总阀

B.放空阀

C.主汽门

D.排液阀