Lub ntsiab tseem ceeb ntawm qhov kev pov tseg ntawm pov tseg
1. Lub ntse ntse ntawm lub hniav. Lub loj dua lub ces kaum ntawm cov hniav, qhov yooj yim mus ua pov tseg ntawm pov tseg.
2. Lub tswv yim modulus ntawm lub pwm.Thaum thwj qhov tuag ntawm txhua lub chaw nres tsheb, qhov uas yuav tsum tau txhaj rau qhov kev txhaj tshuaj tiv thaiv yog qee yam.
3. Puas tsim nyog tuag puas tsim nyog? Tsis tsim nyog tuag taus, yooj yim ua rau muaj kev pov tseg.
4. Txawm muaj roj nyob saum npoo ntawm cov ntawv tais.