单项选择题
While underway at night you observe a vessel’s range lights in line off your starboard beam． You should（）.
A.come right B.sound the danger signal C.continue on your course D.come left
单项选择题 You are in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.
单项选择题 You are approaching another vessel and are not sure whether danger of collision exists. You must assume（）.
