Raws li ib feem tseem ceeb ntawm cov txheej txheem pwm tsim, cov pwm qhia ncej yog siv rau kev taw qhia, txhawb nqa thiab muab tso rau. Cov kev taw qhia muaj nuj nqi yog xyuas kom meej tias thaum lub sij hawm tus txheej txheem ntawm kev txav thiab kho cov pwm, nws tuaj yeem lav qhov kev sib raug zoo, kom tsis txhob muaj qhov tsis zoo ntawm cov pwm thiab qhov poob ntawm cov haujlwm yooj yim thiab cov xwm txheej tsis zoo. Lub luag haujlwm ntawm kev txhawb nqa yog kom tsis txhob skew ntawm ejector phaj thaum lub sij hawm ejection txheej txheem. Nws tuaj yeem hais tias nws txhawb nqa lub ejector phaj kev ua haujlwm thiab ua kom lub ejector phaj nyob ruaj khov thaum lub sijhawm ua haujlwm. .
Raws li ib qho ntawm cov khoom tsim los ntawm cov pwm niaj hnub, cov lus qhia kev tshaj tawm muaj lub luag haujlwm ntau dua. Vim qhov kev ua tau zoo ntawm cov lus qhia hauv kev lag luam, nws yog dav siv. Txawm hais tias nws yog kev ua cov pwm los yog daim ntawv thov ntawm lwm cov kev lag luam, xws li kev lag luam hluav taws xob, khoom siv tshuab, khoom siv hluav taws xob, teeb pom kev zoo, thiab lwm yam, nws yog siv hauv kev lag luam pwm. Nws tuaj yeem hais tias lub luag haujlwm ntawm cov lus qhia thiab kev ua haujlwm ntawm nws cov txheej txheem yog qhov tseem ceeb ntawm kev txiav txim siab seb qhov zoo ntawm cov pwm yog qhov zoo lossis qhov tsis zoo, thiab nws tseem yog qhov tseem ceeb ntawm cov txheej txheem pwm tsim.
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