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L = �往�p---�ڭh(hu��n)���|(zh��)(��ͨ��\䓲ġ����P䓲�)
A= 1̖��,��B= 2̖����C= 3̖��,��D= 3̖��
�^�V��e��1̖��=0.25,��2̖��=0.5��3̖��=0.8,��3̖��= 0.15
���γߴ繫��mm�� ≥0.3-0.8 ≥0.3-0.8 ≥0.3-0.8 ≥0.3-0.8
�^�V��(x��)�ȣ�μ�ף���1,��3��5,��10,��15��20,��25,��50��75,��100,��150��200
��߲������� (MPa) ��0.4,��0.3,��0.2
��߲����ض� (��)�� ������PE��130 ( ˲�g180