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【单选题】
The main difference between rotorcraft and helicopter is that ____.
A.
They have different fuselages
B.
They have different rotor
C.
They have different way to drive the rotor
D.
If their rotor can generate lift or not
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【多选题】The advantages tiltrotor aircraft have over helicopter are ____.
A.
Longer flight range
B.
Lower cost
C.
Simpler structure
D.
Higher speed
【单选题】The “Cassini-Huygens” Saturn probe took ____ to reach the orbit around Saturn.
A.
7 months
B.
11months
C.
7 years
D.
11 years
【多选题】Countries that can launch lunar probes includes: ____.
A.
The United States
B.
Russia
C.
China
D.
India