题目内容

The conditions should be considered when determine the launch window include: ____.

A. Preparation situation of carrier rocket
B. The ground observation and tracking condition
C. Orbit operation requirement
D. Return location

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The launch orbits of spacecraft include: ____.

A. Direct orbit injection
Ballistic orbit injection
C. Sliding orbit injection
D. Transition orbit injection

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The turbofan engines used on military aircraft have characteristics as: ____.

A. Low bypass ratio
B. High bypass ratio
C. Have afterburner
D. The engine is featured inside the airframe

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Nozzles that capable of implementing thrust vectoring technology includes: ____.

A. Binary thrust vectoring nozzle
B. Axisymmetric thrust vectoring nozzle
C. Adopts baffle behind the nozzle
D. Steerable vertical take-off and landing nozzle

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Compared with piston engines, the main advantages of turboshaft engines are: ____.

A. Low fuel consumption
B. High power
C. Light weight
D. Low noise

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The conditions should be considered when determine the launch window include: ____.

A. Preparation situation of carrier rocket B. The ground observation and tracking condition C. Orbit operation requirement D. Return location

The launch orbits of spacecraft include: ____.

The turbofan engines used on military aircraft have characteristics as: ____.

Nozzles that capable of implementing thrust vectoring technology includes: ____.

Compared with piston engines, the main advantages of turboshaft engines are: ____.

A. Preparation situation of carrier rocket
B. The ground observation and tracking condition
C. Orbit operation requirement
D. Return location