For the evaluation index Y 1 , the factors X 1 , X 2 , X 3 , X 4 , X 3 X 4 , X 2 2 , X 4 2 had extremely significant influences, while the factors X 1 X 4 , X 2 X 4 had a significant influence.
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Numerical simulation and parameter optimization of earth auger in hilly area using EDEM software.
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