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下列叙述中可能包含着一些错误，请你在不改变论述主题和不显著缩减内容的前提下改写成正确的叙述。 分子轨道（MO）是分子中的单电子空间波函数，可以用原子轨道的线性组合来表示，MO并不表明了电子运动的确切轨迹。分子的Schrödinger方程可以利用变分法近似求解，由此得到的能量总是等于或低于分子真实的基态能量。求解方程时通常使用近似，因为分子的核骨架实际上固定不变的。分子中电子数如果是偶数，分子就必然是反磁性的，例如O 2 分子就是如此。根据电子在MO上的排布可以计算键级，键级都是一些整数。
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举一反三
【简答题】车钩的三态作用是利用车钩提杆把 提起或落下,通过 与钩铁的作用,使车钩处于闭锁、开锁和全开状态。
【单选题】Hastings's response to Markham's argument that the history of the American government 'shows that it [the Electoral College] is doing something right' would most likely be which of the following?
A.
Under the current system, each voter in Alaska has proportionately three times as much voting power as each candidate in Florida.
B.
We do not know whether or not the American government would have been equally stable had the president been elected by a direct popular election since the beginning.
C.
If the candidate who lost the popular election won the presidency four times in 200 years, there is something wrong with the system.
D.
Maintaining a strong federal system is less important than upholding the principle that each vote should count equally.
E.
A process that maintained the Electoral College but removed the winner-take-all system would substantially reduce the disenfranchisement that occurs under the current system.
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