- initial level
- 基准面: base level; datum plane; ref ...
- 标高: elevation; level; altitude; ...
- 基准面标志浮筒: datum marker buoy
- 基准标志浮标基准面标志浮筒: datum marker buoy
- 地面标高: dmbg; floor level; gl ground leel; ground elevation; ground height; ground level
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