| 摘要 |
The resonance tube plug (1) consists of two parts (10, 11) with a gap (4) between them that can be adjusted by means of a screw (3). The two parts are in the form of metal, plastic, wood or rubber discs, one of which is cone-shaped with an angle of taper between 0.5 and 45 deg, and the other is rigid and has a diameter equivalent to the internal section of the tube.
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