1. Ho hanyetsa ho apara hantle: Hobane pipe e entsoeng ka ceramic e entsoe ka li-ceramics tsa corundum (bothata ba Mohs bo ka fihla ho 9.0 kapa ho feta). Ka hona, mecha ea phatlalatso ea ho sila e tsamaisoang ke metallurgical, matla a motlakase, merafo, mashala le liindasteri tse ling li na le khanyetso e phahameng ea ho apara. E netefalitsoe ke indu ...
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