asymmetric carbon a 不对称碳原子
Towards a Low Carbon Economy 促进低碳经济 ; 年 ; 年促进低碳经济 ; 后果堪忧
A low carbon economy 低碳经济 ; 实行低炭经济
A low carbon life 低碳生活
a carbon steel a碳钢
a carbon of a letter 一封信的副本
carbon angiography a aratus 心血管造影术设备
a 3 carbon steel a碳钢
That represents more than six million tonnes of carbon a day.
这相当于每天600多万吨碳。
Compared to the 1960s, each hectare of intact African forest has trapped an extra 0.6 tonnes of carbon a year.
和六十年代相比,每年每公顷原始森林额外多吸收了0.6吨碳排放。
And the result? Well not quite what I'd imagined - my family is responsible for almost 10 tons of carbon a year!
可是结果如何呢,然而与我想象中的大相径庭的是,我的家庭居然会承担几乎每年十吨的碳消耗量!
The researchers found the presence of carbon thirteen, a version of the carbon atom that is usually found in space.
VOA: special.2009.09.30
So in terms of the first step of skeletal structure, this is actually going to be easier because we don't have a central atom, we just have carbon and nitrogen here.
对于第一步画出骨架,其实比刚才更容易,因为我们没有一个中心原子,我们这里只有碳和氮两个原子。
So let's take the case of acetylene where we have two carbon atoms that are going to be triple bonded to each other, each are bonded to a carbon and then to one hydrogen.
让我们来看一看乙炔的例子,我们有两个碳原子,成三键,每个碳和一个碳一个氢相连。
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