单项选择题
You have been informed that dredging operations may be underway in your vicinity.Which buoy indicates the dredging area（）.
A.White buoy with a green top B.White and international orange buoy C.Yellow buoy D.Yellow and black vertically-striped buoy
单项选择题 You determine your vessel’s position by taking a range and bearing to a buoy.Your position will be plotted as a（n）（）.
单项选择题 Which statement concerning current is TRUE（）.
单项选择题 Which position includes the effects of wind and current（）.
