1, nyuma yo gukoresha imimero yicyuma igomba gushyirwa mukibanza cyabigenewe, ikabikwa mu ruganda ruhumeka, rwumye, rufite isuku, ukoresheje intoki. 2, ubuso bugomba guhora burinda ingese, ntibyemewe muri acide, alkali, umunyu, imyuka ya chimique no kubika amazi. 3, birabujijwe mu bushyuhe bwo hejuru ...
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