单项选择题
A.0.1MPa~0.2MPa B.0.3MPa~0.5MPa C.0.5MPa~0.7MPa D.0.7MPa~0.9MPa
A.1.0MPa~1.2MPa B.1.2MPa~1.8MPa C.1.8MPa~2.5MPa D.2.0MPa~3.0MPa
A.1.5MPa~2.5MPa B.2.5MPa~3.5MPa C.3.5MPa~4.5MPa D.4.5MPa~5.5MPa