题目内容
The “Cassini-Huygens” Saturn probe took ____ to reach the orbit around Saturn.
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The most widely used manned space vehicle is ____.
Two main landing gears at the rear of the aircraft's center of gravity, with a nose landing gear at the front is the layout structure of ____.
The take-off deck of an aircraft carrier usually is ____ long.
The marker beacon of the instrument landing system is use to provide ____ information.
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