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Science 19 Online
tristenk:

Which existing technology did engineers use to enhance the speed of propeller-driven airplanes?

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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