送交者: mangolasi 于 2006-1-10, 06:36:15:

回答: 说说为什么早晨和晚上空气好 由 疫苗 于 2006-1-10, 04:21:41:

Photosynthesis takes place only in the daytime. But the trees are breathing 24-hour. I guess the fresh oxygen is at lowest level in the morning if the trees are consuming oxygen in a constant rate.

• No. Constant rate of oxygen consumption is only helpful in finding out - mangolasi (352 bytes) 2006-1-10, 06:39:28
  • 中午跑吃的灰多， 早上跑少。 - dahuaidang (0 bytes) 2006-1-12, 02:08:17

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