- floor sill
- 钻台: drill block; drill floor
- 底: bottom; base
- 梁: beam
- 底梁: base girder; bedstone; bottom girder; collar; floor bar; floor beam; ground sill; groundsel; groundsill; main timber; mudsill; sill
- 表明钻台底下气动绞车的安全工作负荷: clearly mark safe working load on the air winch below the rig floor
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