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4. Ships engaged in dredging or underwater operations shall display the lights and types specified in subparagraphs (1), (2) and (3) of paragraph 2 of this Article when their maneuvering capability is limited. In addition, when there is an obstacle, it should also be displayed:张家和郑家，已经不是他们可以瞧不起的了。The unit of length is 12 inches per foot, the unit of weight is 12 ounces per pound, and the unit of weight is 12 pence per shilling. Even the imperial length of penalty kicks in football matches is 12 yards.In addition, it is worth noting that in recent years, many K12 discipline education institutions have gradually extended their applications to the field of quality education based on the original discipline system.　　在这个热带城市，有着这样一个团队，他们严谨敬业，他们辛勤客观，他们由鉴证人员，验尸官，调查员等各方面的专家组成，出入各个案发现场，用锐利的眼神寻找蛛丝马迹，巧妙利用弹道学、犯罪危险因子学、法医毒理学、DNA鉴定、咬痕与血型分析、齿 、科学、昆虫学、痕迹学和犯罪变态心理学抽丝剥茧，将支离破碎的线索拼凑起来，还原出事实真相。就算强行凑巧，船长副手不分也就罢了，可一船那么多人，都犯这个错误实在是太小概率的事件了。忽地身子一歪，有悬空跌落的感觉。