a linear model的用法和样例：
- Advertisement competition is studied under the monopolizing of double oligarchies by a linear model.
- Moreover,we compare the performances between these two estimations for a linear model with random input.
- To improve the measuring precision of the automobile caster by a linear model on the four-wheel aligner, a precise measuring model was built.
- According to an undercarriage loading system of an airplane, a linear model of an electrohydralic servo system was established and simulated.
- Many standies have indicated the macroeconomy depicted by multiplier-accelerator model is a linear system S, and the model is classic linear model.