- 水封: water block; water closing; ...
- 顶水: top water
- 油罐浮顶水封的挠性金属密封套: flexible metal shoe
- 水封: [油工] water block; water closing; water lute; water seal◇水封爆破 waterinfusion blasting; 水封槽 water sealed tank; 水封储气器 water-sealed gas holder
- 封顶水平: level of cap
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