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這個是流體力學的一個基本原理,連貫流體(包括流體和氣體)流動時,在一個通路上流體流動速度與流體截面積的乘積是一個常數.具休到這個漏斗就是管口處的空氣流速高於漏斗上面的空氣流速,這樣一來呢,在桌球的下方的空…
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