单项选择题
When hitting a solid object such as a ship or an airplane，the radar waves are reflected back （）they came.
A.in the way B.the way C.by the way D.through the path
单项选择题 What will cause the ARPA to emit a visual alarm，audible alarm，or both?（）
单项选择题 What provides little or no indication that a vessel is dragging anchor? （）
单项选择题 What is TRUE when operating in fog and other vessels are detected by radar?（）.
