A.used
B.available
C.in use
D.can be used
您可能感興趣的試卷
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
Which general statement concerning radar is FALSE?（）.
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? （）
（）is not used in modern radar.
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.
Which statement about an estimated position is TRUE?（）
Which statement concerning the operation of radar in fog is TRUE?（）
When using a radar in a unstabilized mode，fixes are determined most easily from（）.
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（）.
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.