... 通风速度 draft velocity 均衡通气 draft，balanced 强力通风 draft，forced ...
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liquid velocity in draft tube 液体环流速度
Influenced by the water depth of ship sea trial area, velocity measurement of deep-draft large-scale ship should be shallow-water corrected with proper method.
受实船试航水域水深的影响，对于深吃水的大型船舶航速测量结果必须采用适当的方法进行航速的浅水修正。
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