النواقل و العوازل

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مسمار</TD>
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مسطرة

بلاستكية</TD>
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ممحاة</TD>
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شريطا

المطاط</TD>
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مدور

معدني</TD>
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غرافيت قلم الرصاص</TD>
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ماء نقي</TD>
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المحلول الملحي</TD></TR>
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ناقل</TD>
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عازل</TD>
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