According to this passage "Mach" refers toA.the ratio of the air speed of an aircraft to

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According to this passage, "Mach" refers to

A.the ratio of the air speed of an aircraft to the speed of sound.

B.a machine.

C.a Czech-born Australian physicist.

D.the pilot of the plane.

请帮忙给出正确答案和分析,谢谢!

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