sighting the bottom
... 检查表 check-off list 检查船底 sighting the bottom 检查代号 audit code ...
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船底检查 survey of ship bottom ; bottom survey ; survey of ship bottom west bank
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确保所有施工区域必须有足够的照明（舱内为防爆照明），以便于施工和检查，尤其是船坞平船底。
To ensure allworking area has enough illumination (it was anti-explosion illumination insideof tank) to easy for working and inspecting, especially flat bottom in drydock.
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