A.31.9MPa B.29.35MPa C.31.09MPa D.31.1MPa
A.初壓力為1MPa,正常壓力為0.2MPa B.初壓力為0.2MPa,正常壓力為1MPa C.初壓力為0.5MPa,正常壓力為1MPa D.初壓力為1MPa,正常壓力為0.5MPa
A.Ⅲ B.Ⅱ或Ⅲ類 C.Ⅱ類 D.Ⅲ類或Ⅳ類