1, lub qhov cub nyob rau hauv lub hwj chim, yuav tsum tau tsim tsim nyog, lub hwj chim yog me me, tsis tshua muaj efficiency, lub hwj chim yog loj, loj zog noj ntawm qhov cub, siv thiab yuav cov qhov cub, yuav tsum xaiv ib tug kws chaw tsim tshuaj paus;
2, raws li lub qhov cub khoom kub, teem ib tug xov tooj ntawm txawv zog.
3, qhov kub sib txawv qhib qhov sib txawv cua sov chav tsev; yog li kom ua tiav cov txiaj ntsig ntawm kev txuag hluav taws xob;
4, txhim kho kev ua haujlwm zoo, qhov cub yuav tsum tau muab tua thaum tsis ua haujlwm
