So, as they're very quietly handing out your class notes, let's think about what this bond is here, this boxed bond, is it a pi bond or a sigma bond?
在他们发讲义的同时,我们来看看这个键,方框里的这个键,它是sigma键还是π键?
麻省理工公开课 - 化学原理课程节选
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