Cov menyuam saw nro
Cov menyuam nro no yog ib qho tseem ceeb ntawm kev tswj cov cuab yeej rau txias dov thiab strip ua kab. Nws tsim kev ruaj khov strip nro. Nws nres strip wandering. Nws ua kom lub strip nruj thiab txawm. Nws straightens lub phaj steel. Nws txo qis strip deformation kuj. Cov menyuam no ncaj qha txiav txim siab strip zoo thiab ntau lawm stability.




