A.低壓液化氣體,公稱工作壓力1MPa B.高壓液化氣體,公稱工作壓力20Mpa,15Mpa,12.5MPa C.高壓液化氣體,公稱工作壓力20MPa,15Mpa D.永久氣體,公稱工作壓力30MPa,20MPa,15MPa