单项选择题
A.0.2MPa蒸汽B.0.5MPa蒸汽C.1.7MPa蒸汽D.4.5MPa蒸汽
A.20%B.30%C.40%D.50%
A.0.1B.0.15C.0.2D.0.25
A.8B.10C.12D.15
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