A.used
B.available
C.in use
D.can be used
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A.unwanted interference
B.unexpected figures
C.abnormal data
D.unwanted information
最新試題
What provides little or no indication that a vessel is dragging anchor? （）
PPI is（）.
（）typically extends from close as 0.1 nautical miles out to 32 NM.
Your radar is set on a true motion display.Which of the following will NOT appear to move across the PPI scope（）.
You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.
Which general statement concerning radar is FALSE?（）.
When using the ARPA in heavy rain，which action should you take? （）
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.
Which statement is TRUE concerning a vessel equipped with operational radar?（）.