单项选择题
A.power-driven vessel stopped and making no way through the water
B.vessel being towed
C.vessel restricted in her ability to maneuver at anchor
D.sailing vessel at anchor
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? （）
单项选择题 A stand-on vessel in a crossing situation is allowed to take action when（）.