题目内容

The US space shuttle has ____ main engines.

A. 3
B. 4
C. 5
D. 6

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Near space vehicle includes: ____.

A. Solar-powered plane
B. Stratospheric airship
C. F-22 aircraft
D. X-51A hypersonic aircraft

Main differences between balloon and airship are ____.

A. Configuration
B. Motive power
C. Direction Control
D. Filling gases

The advantages tiltrotor aircraft have over helicopter are ____.

A. Longer flight range
B. Lower cost
C. Simpler structure
D. Higher speed

Countries that can launch lunar probes includes: ____.

A. The United States
B. Russia
China
D. India