送交者: tinaliang 于 2009-01-07, 16:33:39:

回答: vibration does that regardless - if works, it would have saved a part 由 meiyou 于 2009-01-07, 16:31:40:

• i do - knock on the shell you can hear (无内容) - meiyou (0 bytes) 2009-01-07, 16:42:32 (291513)
  • that's not resonant frequency, besides, you don't want sound to be heard. (无内容) - tinaliang (0 bytes) 2009-01-07, 18:22:45 (291529)

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