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Table 4

Results of range analysis

Item Tensile strength /N·m-1
k1 373 435 480
k2 494 532 486
k3 508 491 452
k4 520 436 475
Variance 135 97 34

ki (i=1, 2, 3, 4) is the average value of the i-th level tensile strength of a factor

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