1. Steel taug qab undercarriage tshwj xeeb tsim los thauj tsheb nyob rau hauv suab puam
2. Cov ncej zoo thiab cov khoom siv rau cov menyuam ua kom lub tsheb ruaj khov
3. Cov qauv tsim yog yooj yim thiab tshwj xeeb, yooj yim rau kev hloov mus rau cov suab puam ib puag ncig thiab yooj yim los tswj
4. Cov qauv zoo li yog atmospheric thiab pom zoo los ntawm cov neeg siv khoom