单项选择题
A. rescue boat B. garbage boat C. patrol boat D. fire boat
灯船（）A. ferryB. life-raftC. lightshipD. lamp ship
单项选择题灯船（）
A. ferry B. life-raft C. lightship D. lamp ship
引航艇（）A. pilot ladderB. pilot stationC. pilot lampD. pil...
单项选择题引航艇（）
A. pilot ladder B. pilot station C. pilot lamp D. pilot boat
信号旗（）A. signal lightB. signal flagC. ensignD. jack
单项选择题信号旗（）
A. signal light B. signal flag C. ensign D. jack
