The four factors of the three levels of orthogonal experiment design are: A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4

The four factors of the three levels of orthogonal experiment design are: A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4

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