head and stern leading mark

鸭艉艏,fa... ... ) bow and stem outer plates 艏艉外板 ) head and stern leading mark 艏艉导标 ) fore-aft symmetry 艏艉对称 ...

航海... ... head and stern anchoring 首尾锚泊 head and stern leading mark 首尾导标 head and stern leading marks 首尾导标 ...