送交者: tinaliang 于 2010-05-19, 15:33:35:

• 空气瓶太大也不成。 (无内容) - DW (0 bytes) 2010-05-19, 16:15:40 (443468)
• How big or how long is the tube? You may - Hoffman (16 bytes) 2010-05-19, 15:58:01 (443453)
  • good question. suppose we have a exhale valve at mouth. (无内容) - tinaliang (0 bytes) 2010-05-19, 16:03:47 (443457)

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