Ntau npaum li cas ntawm cov maus taus tim saw hlau yuav tsum tau hloov

Thaum lub sij hawm tu ncua ntawm lub maus taus loj mus rau lub suab loj thiab siv tsis tau ib txwm, nws yuav tsis yog ib lossis ob millimeters ntev dua ntawm txoj saw tshiab. Thaum cov saw muaj suab nrov, lub nro kis tseem tseem xoob mus rau qhov ze cov saw. Yog tias nws tsis tuaj yeem tshem tawm, nws yuav tsum tau hloov raws sijhawm.