Steam Powered Airplanes

question 57

Multiple Choice

Steam powered airplanes

• A)were widely used until the 1970s,when jet fuel prices made other engines more efficient.
• B)are impractical because of the low power-to-weight advantage.
• C)were used for commercial air travel but were discontinued because of safety regulations.
• D)are under development and are expected to be the next phase of jet technology.

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