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

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！

参考答案

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