dynamically-positioned derrick barge
... positioned derrick barge 动力定位起重驳 dynamically-positioned derrick barge 动力定位起重驳 twin-hull semisubmersible derrick barge 双身半潜式起重船 ...
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... 动力定位动态定位 dynamicpositioning 动力定位起重驳 positioned derrick barge 动力定位要素 elements of dynamic positioning ...
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