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Calculate with n1 = number of contacts in one line and n2 =
characteristic size of the window
A = (n1x1.27)+1.27
B = (n1-1)x1.27
C = (n2x1.27)-0.40
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*注:请务必信息填写准确,并保持通讯畅通,我们会尽快与你取得联系