当锅炉主汽压力降到（)时开启空气门。A.0.5MPaB.1MPaC.0.2MPaD.3.5MPa。

A.05MPa

B.1MPa

C.02MPa

D.35MPa

A.0.5MPA

B.1MPA

C.0.2MPA

当锅炉主汽压力降到()时开启空气门。

A.0.5MPa

B.1MPa

C.0.2MPa

D.2MPa

A.0.5MPa

B.1MPa

C.0.2MPa

锅炉停炉后，当汽压降低至0.2MPa，开启空气门。( )

A.0.5MPa

B.1.0MPa

C.0.2MPa

D.2.0MPa

A.0.2MPa

B.1 MPa

C.3.5 MPa

A.0.5MPa

B.1MPa

C.0.26MPa

D.3.5MPa

A、0.5

B、1

C、0.2

D、3.5