一道物理题,sat2的.高中没学到这里,自己也不是很懂.A vibrating diaphragm sets up strong vibrations at the mouth of a horizontal tube containing air and a small amount of fine powder.The powder becomes arranged in piles 1 cm apart,and
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![一道物理题,sat2的.高中没学到这里,自己也不是很懂.A vibrating diaphragm sets up strong vibrations at the mouth of a horizontal tube containing air and a small amount of fine powder.The powder becomes arranged in piles 1 cm apart,and](/uploads/image/z/8786315-11-5.jpg?t=%E4%B8%80%E9%81%93%E7%89%A9%E7%90%86%E9%A2%98%2Csat2%E7%9A%84.%E9%AB%98%E4%B8%AD%E6%B2%A1%E5%AD%A6%E5%88%B0%E8%BF%99%E9%87%8C%2C%E8%87%AA%E5%B7%B1%E4%B9%9F%E4%B8%8D%E6%98%AF%E5%BE%88%E6%87%82.A+vibrating+diaphragm+sets+up+strong+vibrations+at+the+mouth+of+a+horizontal+tube+containing+air+and+a+small+amount+of+fine+powder.The+powder+becomes+arranged+in+piles+1+cm+apart%2Cand)
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