Don ƙayyade ko za'a iya amfani da maɗaurin kuma, kafin yanke shawara, ya zama dole a yi la'akari da matakin lalacewa, aikin injin, mahimmanci, yanayin aiki, sake zagayowar dubawa, da dai sauransu kafin yanke shawara. Abubuwan da aka tarwatsa yayin aikin gyaran kayan aiki akai-akai...
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