单项选择题
When using a radar in a unstabilized mode，fixes are determined most easily from（）.
A.center bearings B.tangent bearings C.ranges D.objects that are close aboard
单项选择题 When navigating in thick fog with the radar on，you should（）.
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.
单项选择题 What will cause the ARPA to emit a visual alarm，audible alarm，or both?（）
