Cov txheej txheem:

Dab tsi yog suav tias yog ib qho kev ntsuam xyuas rau cov ntaub ntawv nug?
Dab tsi yog suav tias yog ib qho kev ntsuam xyuas rau cov ntaub ntawv nug?

Video: Dab tsi yog suav tias yog ib qho kev ntsuam xyuas rau cov ntaub ntawv nug?

Video: Dab tsi yog suav tias yog ib qho kev ntsuam xyuas rau cov ntaub ntawv nug?
Video: lus nug txog kev npau suav..2/21/2022 2024, Kaum ib hlis
Anonim

Ntau QD kev xeem koom nrog kev sib piv ntawm cov nug cov ntaub ntawv , los yog cov khoom ntawm cov daim ntawv , mus rau cov txheej txheem paub. Feem ntau ntau laj xeem suav nrog kev sau ntawv uas tus kws tshuaj xyuas sim daws cov kev txhawj xeeb txog kev muaj peev xwm sau ntawv.

Ua raws li qhov kev pom no, 5 hom Cov Ntaub Ntawv Cov Lus Nug yog dab tsi?

Qee yam ntawm cov ntaub ntawv nug uas raug kuaj xyuas cov ntaub ntawv pov thawj tau hais hauv qab no

  • • Xav. • Tshawb xyuas. • Cov Nyiaj Txiag Nyiaj Txiag. • Daim ntawv cog lus. • Cov ntawv txais nyiaj.
  • • Tub Sab Nraud. • Kev dag ntxias. • Kev cuav. • Kev tua tus kheej. • Kev tua neeg.
  • • Nto nta. • Cov duab latent. • Kev hloov pauv. • Watermarks. • Ink stamps.

Tsis tas li ntawd, daim ntawv nug dab tsi piav txog yam tsawg kawg ib qho piv txwv ntawm qee yam uas tej zaum yuav yog ib daim ntawv nug? Piav tsawg kawg ib qho piv txwv ntawm tej yam uas tej zaum yuav yog ib daim ntawv nug . A nug cov ntaub ntawv yog ib qho daim ntawv nrog sau ntawv los yog ntaus ntawv uas yog nug txog nws txoj cai. Ib qho piv txwv yuav yog phau passport.

Ib yam li ntawd, tib neeg nug, Cov Ntaub Ntawv Questioned muaj dab tsi?

A nug cov ntaub ntawv yog ib tsab ntawv, kos, daim ntawv tsav tsheb, lossis lwm yam daim ntawv nws qhov tseeb yog qhov tsis sib haum xeeb. Cov cwj pwm ntawm cov daim ntawv uas tuaj yeem nug tau suav nrog kos npe, sau ntawv, thiab ntaus ntawv.

Dab tsi yog cov cuab yeej lossis cov ntaub ntawv uas tus Kws Tshawb Fawb xav tau los txheeb xyuas cov ntaub ntawv nug?

Ib qho raug Cov ntaub ntawv nug chav nyob hauv chav kuaj ua txhaum cai yog nruab nrog lub tshuab ntsuas hluav taws xob, ntsuas cov duab digital, infrared thiab ultraviolet lub teeb ci, video cov cuab yeej tsom xam thiab tshwj xeeb khoom siv suav nrog electrostatic detection devices (EDD) thiab cov khoom siv los ua chemistry analytical.

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