.

1, Kev tsim ua ntej, txheej txheem tsim khoom zoo meej, tswj cov txheej txheem nruj, txhim khu kev qha thiab ruaj khov

2, Cov qauv tsim tshwj xeeb lav cov roj hmab elasticity nyhuv

3, Kev foob zoo daws cov teeb meem roj to

4, Cov roj pov thawj zoo thiab muaj kuab paug me me rau cov roj transformer

5, Xaiv cov ntaub ntawv ua tib zoo thiab tsim kom zoo kom lub foob zoo.