(b)该船舶已开始装配，而装配量至少为50公吨或所有结构村料估计重量的1%，取其小者；“首垂线”(forward perpendicular) 指本规例所界定的船舶长度的最前端；
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... perpendicular magnetization 垂直磁化,横向磁化... forward perpendicular 艏垂线 perpendicular distance 垂(直)距(离)...
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sheer at forward perpendicular 首舷弧 ; 首尾舷弧
draft at forward perpendicular 首垂线处吃水
From the side, the front line is perpendicular and straight, coinciding with the maxillary edge or slightly projected forward.
从侧面看，前行是垂直而直，与上颌骨边缘或稍向前预测相吻合。
The Terrier's legs should be carried straight forward while traveling, the forelegs hanging perpendicular and swinging parallel with the sides, like the pendulum of a clock.
该梗犬在行进中要求腿部笔直向前，前腿垂直悬起，如同钟摆般向身体两侧平行摆动。
From the transfer dynamics in perpendicular gas-liquid phase flow point of view, this paper put forward a calculating method of air volume in deep-well process design.
从垂直气液两相流运行动力学角度，提出深井工艺设计中空气量的计算方法。
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