97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区 狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

單項(xiàng)選擇題

With reference to rules governing steering gear, which one of the following rules is incorrect? ()

A.It is required that all ships are provided with two independent steering gear systems that is one main and one auxiliary
B.The auxiliary gear could be power operated in passenger ships
C.The auxiliary gear must be of adequate strength and sufficient to steer a ship at navigable speed
D.All moving parts of the steering gear must be guarded against any possible damage

微信掃碼免費(fèi)搜題