Mzere wapamwamba umatanthawuza mzere wotseguka pamwamba womwe umakhazikitsidwa pansi, womwe ndi chingwe chamagetsi chamagetsi chomwe chimakhazikitsidwa pa nsanja ya pole ndi zotetezera ndi zopangira mphamvu.Zimapangidwa ndi mawaya ndi mawaya apansi (waya wapansi panthaka), nsanja, insulator, hardware, ndi zigawo zina za maziko a nsanja ...
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