Yog tias nws yog ib qho pwm qub, nws muaj peev xwm ua tau tias cov kav dej kub khiav cua sov tau puas lawm.
Los yog seb qhov kub khiav tsis tau nruab, seb cov kua nplaum nkag yog qhov tseem ceeb los ntawm lub nozzle deformed, yog tias cov no tsis suav nrog, nws yog qhov dej hauv dej me me dhau, thiab kev txhaj tshuaj ntau dhau.
