Tus minatboard

OSB2 yog qib siab tshaj-qib tsim rau cov ntawv thov thauj khoom hauv OSB1 tab sis yog tseem tsis tsim nyog rau ib puag ncig nrog cov dej noo lossis av noo .

OSB3 yog cov kev siv OSB feem ntau, tsim los rau kev siv cov khoom siv noo noo thiab yog haum rau kev xaiv sab hauv noo thiab sab nrauv thiab kev xaiv sab nraud thiab kev xaiv tsis tu ncua thiab {3}