排水量船长比
displacement length ratio
displacement curve displacement leangth ratio
载重量排水量比
deadweight-displacement ratio
重量排水量比
weight-displacement ratio
《国际船舶无线电台一缆表》
International List of Ship Stations
船舶无线电区域广播站
ship broadcast-area radio station
船舶无线电通信
marine radio communication
无水无灰煤
moisture and ash-free coal
moisture ash free coal