A.be more suitable for river and harbor navigation
B.provide better range performance on low lying targets during good weather and calm seas
C.have a wider horizontal beam width
D.have more sea return during rough sea conditions
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A.sweep introduction
B.sweep interest
C.sweep intention
D.sweep intensity
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
A.in dense fog
B.in boisterous weather
C.in the open sea
D.in rivers
A.incorrect image
B.distinctive image
C.pictorial image
D.pictographic image
A.with
B.to
C.for
D.of
最新試題
Radar reflectors are required for（）.
When hitting a solid object such as a ship or an airplane，the radar waves are reflected back （）they came.
When using the radar for navigating（）.
You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.
（）is not a job of the radar antenna.
When will the float-free emergency position indicating radiobeacon be activated after abandoning ship? （）
Which statement concerning the operation of radar in fog is TRUE?（）
You are underway at 5 knots and see on your radar a contact 10 miles directly astern of you. 12 minutes later，the contact is 8 miles directly astern of you. What is the estimated speed of the contact? （）
Your radar displays your ship off center．As you proceed on your course， your ship’s marker moves on the PPI scope while echoes from land masses remain stationary.What is this display called（）.
PPI is（）.