Hikelok muaj cov khoom lag luam ntau ntau yam thiab cov khoom siv hluav taws xob, cov khoom siv lub zog, cov txheej txheem ua haujlwm, cov txheej txheem ua ntej, cov cuab yeej ntsuas thiab cov cuab yeej siv tes.
Hikelok piv txwv Regulators npog cov kev tswj hwm lub siab, rov qab cov kev tswj hwm rov qab, dual theem siab regulator thiab hloov pauv.
