A.used
B.available
C.in use
D.can be used
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你可能感興趣的試題
A.unwanted interference
B.unexpected figures
C.abnormal data
D.unwanted information
最新試題
The development of（）led to the fully automatic ARPA systems installed on commercial ships.
When navigating in thick fog with the radar on，you should（）.
PPI is（）.
When using the radar for navigating（）.
When hitting a solid object such as a ship or an airplane，the radar waves are reflected back （）they came.
Radar reflectors are required for（）.
Your radar is set on a true motion display.Which of the following will NOT appear to move across the PPI scope（）.
Which statement about an estimated position is TRUE?（）
Your ARPA has automatic speed inputs from the log．Due to currents，the log is indicating a faster speed than the speed over the ground.What should you expect under these circumstances（）.
Your ARPA has two guard zones.What is the purpose of the inner guard zone（）.