Yog vim li cas rau molten hlau to hauv lub hlau melting rauv vim qhov sib piv ntawm cov khoom siv hauv qhov cub 5

Qhov piv ntawm cov ntaub ntawv siv rau hauv qhov cub tsim: cov neeg siv dav siv ua lawv tus kheej npaj. Thaum cov txheej txheem npaj, cov neeg ua haujlwm tsis ua haujlwm raws li qhov tseeb. Cov ntaub ntawv npaj ua kom sov yog qhov sib txawv thiab qhov ceev tsis txaus, ua rau muaj hluav taws xob tsis txaus, feem ntau txog 40-50 rhuab. Nws raug nquahu kom siv cov khoom siv ua kom tiav rau hauv cov khoom siv ua tiav los ntawm cov chaw tsim khoom ntawm cov khoom siv hauv cov khoom siv ua kom sov. Nta: Qhov sib piv, sib xyaw ua ke, siab ceev, thiab kev pab cuam lub neej ntawm lub qhov cub hauv ob sab phlu yog siab tshaj 1-2 npaug ntawm cov khoom siv kho cua sov hauv ob sab phlu.