Dab tsi yog xov ntawm lub hau?
Cov xov yog lub ridge uas khiav ncig lub cev ntawm cov ntsia hlau. Thaum saib los ntawm sab, cov xov ntawm ib tug ntsia hlau tshwm raws li ib tug series ntawm ridges thiab grooves raws lub cev ntawm cov ntsia hlau. Txawm hais tias tag nrho cov npoo no yog ib feem ntawm tib cov xov, lawv hu ua threads. | ||||
| suabIb kauj ruam yog qhov kev ncua deb ntawm ib qho mus rau lwm qhov. Qhov kev ntsuas no yuav qhia koj seb qhov ntsia hlau yuav mus deb npaum li cas hauv ib lub kiv puag ncig. Ib tug ntsia hlau nrog lub suab loj (loj nrug ntawm lem) yuav txav mus ntxiv rau ib lub kiv puag ncig. | |||
Ntxiv
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