Txhaj tshuaj blasting tshuab

1)Kev mus nrawm tuaj yeem kho tau los ntawm zaus raws li cov khoom xav tau.

2)Nws tuaj yeem kho qhov nrawm ntawm lub cev muaj zog raws li cov nyhuv blasting

3)Anti-hnav board yog tsim nyob rau hauv chav tsev huv si, kom ntev lub neej ntawm chav huv

4)Nws muaj cov khaubncaws sab nraud povtseg ntawm ob qhov kawg ntawm chav huv, los tiv thaiv cov mos txwv thiab plua plav tawm hauv chav huv.