Terms containing category of ships

Subject	English	Chinese
nautic., tech.	category of polar ship	极地船舶分类
scient.	category of ships	舰种
tech.	eight-hour service provided by ship station of the third category	第三类船舶电台工作八小时
nautic., tech.	oil recovery ship of category A	A 类浮油回收船
nautic., tech.	oil recovery ship of category B	B 类浮油回收船
tech.	sixteen hour service provided by ship station of the second category	第二类船舶电台工作16小时