p*d
发帖数: 2091 | 1 【 以下文字转载自 Notice 讨论区 】
发信人: deliver (自动发信系统), 信区:
标 题: pdd 封 cnhm 在 NextGeneration 版
发信站: BBS 未名空间站自动发信系统 (Mon Apr 2 11:43:08 2012)
【此篇文章是由自动发信系统所张贴】
由于 cnhm 在 NextGeneration 版的 滥发广告 行为，
被暂时取消在本版的发文权力 14 天。
版主:pdd
Mon Apr 2 11:43:02 2012 |
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s****r
发帖数: 5136 | 2 【 以下文字转载自 Notice 讨论区 】
发信人: deliver (自动发信系统), 信区:
标 题: server 封 cnhm 在 Reunion 版
发信站: BBS 未名空间站自动发信系统 (Mon Apr 2 11:02:25 2012)
【此篇文章是由自动发信系统所张贴】
由于 cnhm 在 Reunion 版的 滥发广告 行为，
被暂时取消在本版的发文权力 14 天。
版主:server
Mon Apr 2 11:02:21 2012 |
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c**i
发帖数: 6973 | 4 Eureka!
I finally find out what your tree--and flowers--is.
(1) I consider many possibilities.
One was the original posting was a hoax. I live in Boston, Massachusetts. On
the assumption that late April in Boston is about late October in Sydney,
Australia, I found it hard to believe that trees are so green in Sydney, let
alone flowers in bloom. (In boston, leaves change color and started falling
in mass about mid-October.)
(a) Sydney
http://en.wikipedia.org/wiki/Sydney
Section 2.3 Climate indica... 阅读全帖 |
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z*h
发帖数: 773 | 5 Can we generate and vote the most important chemical reactions in humankind
and modern society?
The first two are:
(1) photosynthesis: CO2 + H20 + hv --> CH2O (carbohydrate) + O2
(2) respiration: CH2O + O2 --> CO2 + H2O + (ATP)
Burning
(3) Coal Combustion: C + O2 --> CO2
(4) Hydrocarbon combustion: CnHm + O2 --> CO2 + H2O
For chemical industries
C + 2H2O --> CO2 + 2H2 or (using methane)
N2 + 3 H2 --> 2 NH3
Making sulfuric acid
Making Cl2 by electrolysis
Oil cracking and reforming |
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