如图所示,将一个普通的乒乓球轻轻放人漏斗中,用力从管口�上吹气,球不会被�上吹起,因为其 填“上方”或“下方”气体流速大,压强小。——青夏 Template




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tomski如图所示,将一个普通的乒乓球轻轻放人漏斗中,用力从管口�上吹气,球不会被�上吹起,因为其 填“上方”或“下方”气体流速大,压强小。——青夏 coloring