Ls lim
Dav:
Cov roj roj roj tshem tau zoo heev tshem tawm cov khoom siv tawv, tawv npuas tawv, lossis cov koog pob txha tawv tsim vim kev laus uas yuav tau sib xyaw thaum lub sijhawm thauj mus los. Nws tiv thaiv cov kis no los ntawm cov kab mob clogging meter lossis faib khoom, kom ua tiav, ruaj khov, thiab niaj hnub muab roj nyob thoob plaws lubrication system.
