A.0.5m B.0.8m C.1m D.1.2m
A.100m B.150m C.300m D.600m
A.緊急切斷閥 B.罐車(chē)海底閥 C.罐車(chē)呼吸閥 D.罐車(chē)車(chē)頂人孔