Ukukhishwa kwe-investimenti, okwaziwa nangokuthi ukukhishwa kwe-wax elahlekile, kwadalwa eminyakeni engu-5,000 edlule.Le ndlela yokuphonsa ihlinzeka ngezingxenye ezinembile, eziphindaphindwayo neziguquguqukayo ezinezinsimbi ezihlukene kanye nama-alloys okusebenza okuphezulu.Le ndlela yokuphonsa ilungele ukusakaza iphunga nezingxenye ezinembayo ...
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