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對(duì)絞的等效外徑:D=1.65d或1.71d(軟質(zhì)用1.65d硬質(zhì)用1.71d)
復(fù)對(duì)絞 D=2.6d
多對(duì)數(shù)絞線:D=根號(hào)N*1.9*d
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