A NASA experimental jet , the X-43A,flew at a world –record

白血病不可怕2022-10-04 11:39:541条回答

A NASA experimental jet , the X-43A,flew at a world –record speed ---11,260 kilometres an hour on November 17.This speed is __ as that of sound.
A.astentimesfast B.tentimessofast C.tentimesasfast D.tentimesfaster

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C

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