【单选题】A: Yellow River. This is Port Radio. What is your present course and speed? Over.B: Port Radio. This is Yellow River. My present course and speed is 115°, 15 knots. Over.Q: What is the course and s...
【简答题】S1:Vessel Blue Whale.What is your present course and speed? Over.S2:Helicopter,this is Blue Whale.My present course and speed is 190 degrees,16 knots.Over.Q:What does helicopter want to know?A. vessel...