单项选择题
A.SeaTalk B.powerful microprocessors and mega memory capacity C.chartplotter D.small-scale chart
The（）has a built-in world map; most areas are displayed...
单项选择题The（）has a built-in world map; most areas are displayed on a scale of 4000 nm from the top to the bottom of the screen，and can be zoomed in to 150 nm.
A.chartplotter B.C-MAP NT C.C-Cards D.PPI
Radar reflectors are required for（）.A.all fishing vesse...
单项选择题Radar reflectors are required for（）.
A.all fishing vessels over 39 feet in length B.sail-propelled fishing vessels C.all fishing vessels of less than 200 GT D.wooden hull fishing vessels with a poor radar echo
PPI is（）.A.a plan-position indicator systemB.pulse-plan...
单项选择题PPI is（）.
A.a plan-position indicator system B.pulse-plan integration C.pulse-pulse input D.power-plan input
