本文介绍了通过在结构单元上增加或者减少不作功的不同约束点，可以改变结构单元应变能的大小的应变能极小原理。
The thesis recommended the theory of minimum strain energy, which says the total structural strain energy can be changed by the increase and decrease of constraint number.
针对动生电动势等于洛仑兹力所作的功的问题，定量证明在动生电动势中洛仑兹力并不作功，并得出洛仑兹力永不作功的结论．。
To answer the question whether Lorentz force does work or not in the case of electromotive force, it is proved that Lorentz force does no work in electromotive force.
针对动生电动势等于洛仑兹力所作的功的问题，定量证明在动生电动势中洛仑兹力并不作功，并得出洛仑兹力永不作功的结论．。
To answer the question whether Lorentz force does work or not in the case of electromotive force, it is proved that Lorentz force does no work in electromotive force.
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