单项选择题
Lighted white and orange buoys must show which color light?（）
A.Orange B.White C.Red D.Alternating yellow and white
单项选择题 In plotting a running fix，how many fixed objects are needed to take your lines of position from? （）
单项选择题 At the magnetic equator there is no induced magnetism in the vertical soft iron because（）.
单项选择题 A vessel’s position should be plotted using bearings of（）.
