The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, are known as "standing waves".
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Acrests and troughs that remain stationary although the air that forms them is moving rapidly, are
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Bcrests and troughs that remain stationary although they are formed by rapidly moving air, are
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Ccrests and troughs that remain stationary although the air that forms them is moving rapidly, is
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Dstationary crests and troughs although the air that forms them is moving rapidly, are
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Estationary crests and troughs although they are formed by rapidly moving air, is
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正确答案: C