Ib qho "yuav tsum tau" kom nyab xeeb thauj khoom thiab tshem tawm cov tsheb thauj khoom!
Ntsib OSHA Cov Lus Qhia tshwj xeeb nrog peb ntau yam Trailer Stabilizing Jacks OSHA 1910.178 (k) (3) hais tias "Txhim kho jacks tej zaum yuav tsim nyog los txhawb nqa ib nrab-trailer thiab tiv thaiv kev siv thaum lub sijhawm thauj khoom lossis tshem tawm thaum lub trailer tsis txuas nrog lub tsheb laij teb" .