Nrog kev txhim kho ntawm ib puag ncig kev paub thiab kev nce qib nruam kev txhim kho ntawm cov roj}}} dawb tshuab tshiab yog xav txog hauv cov hauv qab no:
(1) Lub zog {- kev txuag thev naus laus zis: yav tom ntej tswj cov tshuab hluav taws xob yuav ua rau ua kom tiav zog siv zog ua kom tiav.
(2) Txawj Ntse: Kev txawj ntse yuav yog ib qho tseem ceeb rau kev txhim kho roj ntawm cov roj cua tshuab bline. Los ntawm Internet ntawm cov cuab yeej thev naus laus zis, kev saib xyuas tej thaj chaw deb thiab kev ua txhaum kev ceeb toom ntawm cov cuab yeej tuaj yeem txhim kho kom txhim kho kev ntseeg tau ntawm cov cuab yeej.
(3) Daim ntawv thov nthuav: Daim ntawv thov cov chaw ntawm cov roj - dawb screath blackers yuav txuas ntxiv ntawm kev tiv thaiv ib puag ncig ib puag ncig thiab lub zog tshiab. Tej zaum yuav muaj ntau daim ntawv thov cov xwm txheej yav tom ntej.
Roj - dawb ntsia thawv tshuab ua kom tiav roj {{1} Pub dawb ua haujlwm los ntawm kev tsim qauv thiab thev naus laus zis. Cov yam ntxwv no tau ua rau lawv tau siv dav siv nyob rau ntau yam kev lag luam. Nrog kev nce qib ntawm thev naus laus zis thiab hloov hauv kev lag luam xav tau, lub neej yav tom ntej kev cia siab ntawm roj {}} dawb screat blowers yuav muaj dav dav.
