单选题液化船上的货舱控制式透气系统中如装设由主管机关认可的高速透气阀，则透气管在甲板或纵向步桥上的高度可设至（）以上。A6MB5MC4MD3M
单选题
液化船上的货舱控制式透气系统中如装设由主管机关认可的高速透气阀，则透气管在甲板或纵向步桥上的高度可设至（）以上。
A
6M
B
5M
C
4M
D
3M
参考解析
解析：
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