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?（）.
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，（）
单项选择题 Any vessel（）any other shall keep out of the way of the vessel（）.
