By using the methods of "substitution”,"experiment”,"many solutions to one problem”,this paper solves the applied problems of permutations and combinations,and also solves the difficult prblems such as when to use addition principle,when to use multiplication principle,and when and how to classify.

Using the principle of superposition,a simplified computational method of mass concrete surface temperature change,the lowest temperature value and temperature stress is provided when the temperature drops quickly.

Flat plate steady mathematical model and non steady symmetric model are presented, the analytical solution of temperature of powder is derived on the basis of non steady symmetric model in spheroidal coordinates with the methods of mathematical transformation and principle of superposition.

The energy of electric field stored in the capacitor placed in an alternating electromagnatic field is concluded by using the principle of superposition and by starting with Maxwell equations.

The electric current density fields superposition principle and its applications;

An improved power flow algorithm for meshed distribution networks based on superposition principle and forward/backward sweep method;

Analyses on the essence of problems about superposition principle of quantum states;

Linear equations,superposition theorem, and complex exponential expression;

Furthermore, the superposition theorem is then adopted in the approach, which overcomes the difficulties when applying the symmetrical components to the short circuit calculation.

<Abstrcat> This paper analyses operation accuracy that is influenced by the open input resistance of operation amplifier by means of superposition theorem.