sib nqus thooj av sib nqus siv cov khoom siv hlau nplaum sib nqus los ua lub tshuab hluav taws xob
Sib nqus cov thooj voos kheej kheej thiab cov hlau nplaum nras uas ua lag luam uas ua tau zoo ntawm cov khoom siv sib zog nqus hlau los ua cov tshuab sib txig sib xyaw ua ke, thiab cov khoom uas lawv muag tau zoo txais los ntawm cov neeg siv khoom.
Cov pob zeb sib txawv thiab cov pob zeb nrawm nruam muaj qhov sib txawv nram qab no: Lawv muaj lub zog magnetic field, qhov tob, qauv yooj yim, siv yooj yim, tsis xav tau txij nkawm, tsis muaj hluav taws xob, thiab tsis muaj kev sib txuas hauv cov xyoo siv.
Cov hlau nplaum hlau thiab cov hlau nplaum uas yuav tau ua rau cov hlau nplaum yuav siv tau rau hlau tawm hauv cov lag luam xws li cement, sib sib zog nqus sib cais, tsuas, hlau thiab hlau, tshuaj ua lag luam, hluav taws xob, thiab khib nyiab pov tseg.
