TableĀ 3

The statistical results of the total obstacles of the impact factors

Total obstacle degreeSevere obstructionGeneral obstructionSlight obstruction
Impact factorsA7, B1, C2, C7, C8A1, A2, A5, A6, B2, B3, C3, C4, C5, C6A3, A4, A8, B4, B5, B6, B7, B8, B9, C1

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