Safe speed is defined as that speed where（）. A: you can stop within your visibility range B: the vessel is not subject to vibrations C: you are traveling slower than surrounding vessels D: you can take proper and effective action to avoid collisio

If you hear more than six short blasts and one long blast of the whistle supplemented by the same signal on the general alarm，you should（）. A: start the fire pump B: go to your man overboard station C: go to your lifeboat station D: stand by for collisio

You are under sail and overtaking a tug and tow.Which action is correct（）. A: The power-driven tug must maneuver to avoid collision B: You must maneuver to avoid the tug and tow C: You must maneuver to avoid collision only if the tug is to leeward and the wind is on your port side D: Both vessels are required to maneuver to avoid collisio