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The short length of the column for the first tone is the distance between the node and the node to another position, which is 1/2 λ. length of the short side antenna audio is muted for the first way, the distance between the node and the node position protected, which is 1/4 λ. when comparing the length of the column, the column turned on and turn it on, the length of the column of air is longer than the length of the column to turn it on.
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