为什么氰根（CN）的 C 原子更容易成为配位原子？ - 知乎 当cn-作为亲核试剂时，肯定是homo去进攻亲电受体，于是我们研究一下cn-中哪些ao对homo贡献比较大。 由于N电负性大，N的AO能量比C低，两个align在核间轴上的2p轨道形成的sigma成键轨道（HOMO）的能量会更接近N的2p，所以我们很可能就会断定HOMO的lobe在N原子上更大。
Model Railroading gt; Canadian National red or orange? - Trainorders. com When seen alone, a CN unit may look red, until placed beside a real red loco (like the CP unit shown) Who painted it, natural fading and exposure all affect how we see the color I'm sure others will add their own favorite model paint ref for CN red I don't think I've seen two identical units unless fresh from the builder in the same batch
Canadian Railroads gt; CN, CP train symbols - Trainorders. com Re: CN, CP train symbols Author: BCR_766 Heres a link to the Canadian trackside guide it has all the info needed including scanner channels, locomotive info, train numbers and preserved equipment