单项选择题

A.河船取0.5~0.7MPa,饱和蒸汽/海船取1.0~1.5MPa,过热蒸汽
B.河船取0.3MPa,饱和蒸汽/海船取1.0~1.5MPa,过热蒸汽
C.河船取0.3MPa,饱和蒸汽/海船取0.5~0.7MPa,饱和蒸汽
D.河船和海船均取0.5~0.7MPa/过热蒸汽