Seretse se omileng se kopantsoeng ke motsoako oa lisebelisoa tsa samente (samente, molora oa fofa, phofo ea slag, joalo-joalo), li-aggregate tse khethehileng tse hlophisitsoeng (lehlabathe la quartz, corundum, joalo-joalo, 'me ka linako tse ling li hloka li-granules tse khanyang, perlite e atolositsoeng, vermiculite e atolositsoeng, joalo-joalo. ) 'me metsoako e kopantsoe ka mokhoa o ts'oanang ho propo e itseng ...
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