单项选择题
If your vessel is underway in fog and you hear one prolonged and three short blasts，this is a （）.
A.vessel not under command
B.sailing vessel
C.vessel being towed (manned)
D.vessel being towed (unmanned)
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相关考题
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单项选择题
If there is sufficient sea room，alteration of（）may be the most effective action to avoid close-quarters situation.
A.speed and course
B.speed alone
C.course alone
D.speed or course -
单项选择题
If there is any doubt as to the proper operation of a radar，which statement is TRUE?（）.
A.Only a radar expert can determine if the radar is operating
B.All radars have indicator lights and alarms to signal improper operation
C.A radar range compared to the actual range of a known object can be used to check the operation of the radar
D.The radar resolution detector must be energized to check the radar -
单项选择题
If it becomes necessary for a stand-on vessel to take action to avoid collision，she shall NOT，if possible，（）
A.decrease speed
B.increase speed
C.turn to port for a vessel on her own port side
D.turn to starboard for a vessel on her own port side
