... to fix the course 定航线 to flood dock 船坞灌水 to get a derrick up 起吊杆 ...
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船坞灌水技术 Dock's filling technology
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虹吸管是作为船坞灌水排水的一种新型式，具有结构简单、防冰防沙、断流迅速的优点。
As a new type of drainage and irrigation of the dock, siphon has the advantages of simple structure, protection against sand and water and rapid set-off.
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