Qhov Zoo Ntawm Dawb Corundum

Raws li cov khoom siv hluav taws xob siab, dawb Corundness yog paub txog cov khoom lag luam tsis kam thiab siv tau zoo heev rau muaj jiyesheng hom dawb Corundum, uas yog cov qauv qib kawm, nrog cov ntsiab lus nce txog 99%} Kuv tuaj yeem xa mus rau hauv Hubei thiab nws tau txais kev txhawb nqa hauv Heasi thiab tau muag thoob tebchaws thiab tom qab muag kev pabcuam .}} Nws puas yog cov versatility ntawm kev siv lossis khoom lag luam zoo, nws tuaj yeem ntsib koj cov kev xav tau {}}