1.Siv lub dual hloov AMT cov khoom siv ceev ceev;
2.Equipped nrog kev sib xyaw fabricated vaj tse nrog loj loading peev xwm;
3.Txhim kho qhov hnyav thiab sib npaug ntawm kev ntxhov siab: lub tshuab hluav taws xob longitudinally-layout, kis tau tus mob thiab zaum kawg tsav lain nyob rau hauv pem hauv ntej thiab sab nraum qab ntawm vaj tse.