单项选择题
A. liquid cargo ships B. general cargo ships C. barges D. tugs
（）（滚装船）have doors at the bow or stern.A. TrampsB. Conta...
单项选择题（）（滚装船）have doors at the bow or stern.
A. Tramps B. Container ships C. Ro/Ro ships D. bulk carriers
（）(送出) two head lines ,one from each side.A. Heave away...
单项选择题（）(送出) two head lines ,one from each side.
A. Heave away B. Give out C. Take in D. Take away
We must（）(后移)one metre.A. shift aftB. shift asternC. mo...
单项选择题We must（）(后移)one metre.
A. shift aft B. shift astern C. move aft D. move back
