单项选择题
A.alongside the wharf
B.grounded in the channel
C.at buoys
D.at anchor
单项选择题 When pushing ahead，wires leading from the quarters of the after outboard barges to the bow of a towboat（）.
单项选择题 When operating in an area where sea ice and icebergs are present，which statement is TRUE? （）
单项选择题 Two vessels are abreast of each other and passing port to port in a confined waterway. What should you expect as your bow approaches the screws of the other vessel? （）