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tristenk:
Which existing technology did engineers use to enhance the speed of propeller-driven airplanes?
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Gdeinward:
Please post the multiple choices for this question.
Gdeinward:
I know a thing or two about propeller driven airplanes, but this question is too vague to answer without the choices
Vocaloid:
Choices A. metallurgy B. internal combustion engine C. turbine engine D. computers
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