Ntswg luam yeeb sarp

Cov pa luam yeeb yog tiv thaiv kev tiv thaiv siv rau cov tsheb thauj khoom thiab cov shocks los tiv thaiv kev thauj khoom. Cov Tarps no yog qee zaum hu ua qhov ntswg sarps txij li lawv ib txwm npog sab pem hauv ntej ntawm lub nra. Ib tus pa luam yeeb ib leeg tuaj yeem siv cov pa luam yeeb, cov kab, thiab ob lub tshuab pa roj cargo, lossis ob lub tshuab pa luam yeeb tuaj yeem siv los npog cov thawv ntim khoom thaum ib qho muab tso rau sab nraud.