17. Which of the following about drones is TRUE?
(A) The flight of drones cannot operate by an onboard computer or an autopilot
(B) A drone is an aircraft that operates by a human on board
(C) A drone is also known as an unmanned aerial vehicle (UAV)
(D) Drones are for hobbyists and cannot be used to monitor crop growth
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統計: A(1), B(0), C(5), D(0), E(0) #2847380
統計: A(1), B(0), C(5), D(0), E(0) #2847380