标题: 请教OG95 [打印本页] 作者: ssxxtt27 时间: 2011-8-15 10:59 标题: 请教OG95 The peaks of a ing mountain range,acting like rocks in a streamed 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,is known as "standing waves" C. crests and troughs that remain stationary although the air that forms them is moving rapidly,is E.stationary crests and troughs although they are formed by rapidly moving air,is