送交者: 方舟子 于 2009-09-29, 15:28:14:

回答: interesting, according to the Air Council International, 由 steven 于 2009-09-29, 13:50:26:

• 55 flights sounds right, otherwise, 10 flights per hour will make - steven (52 bytes) 2009-09-29, 18:34:37 (368360)

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