A.預(yù)熱器 B.干燥器 C.減壓流量計 D.以上都是
A.0.4~1.2mm B.0.4~1.6mm C.0.8~1.2mm D.0.8~1.6mm
A.0.4~4mm B.0.8~4mm C.0.4~6mm D.0.8~6mm