单项选择题 A vessel engaged in fishing underway sounds the same fog signal as a（）.

单项选择题 A vessel constrained by her draught shall，when risk of collision with another vessel in a crossing or head-on situation exists，（）.

单项选择题 A towing vessel becomes tripped while towing on a hawser astern. What factor is MOST important when assessing the risk of capsizing? （）