Tsev
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Txoj moo
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Feb 28, 2022
Lub ntsiab kev faib ntawm cov nyees khawmNtawd yog, peb feem ntau hais 14, 16, 18, 20, 60 thiab lwm yam! Nws cov qauv hloov pauv yog: txoj kab uas hla=qauv 0.635 (mm).
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Feb 27, 2022
Cov nyees khawm yog cov hlua khi ntawm cov khaub ncaws siv los txuas ob sab n...Lub luag haujlwm tseem ceeb yog txhawm rau txuas lub placket ntawm cov khaub ncaws, tab sis nws tau maj mam tsim kom muaj kev kos duab thiab kho kom zoo nkauj ntxiv rau kev tswj hwm nws cov haujlwm...
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Feb 26, 2022
Keeb Kwm Ntawm KhawmHauv kuv lub tebchaws, cov nyees khawm tuaj yeem taug qab thaum ntxov li 1800 xyoo dhau los.
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Feb 25, 2022
Lus Taw Qhia Rau Cov KhawmCov nyees khawm, nyob rau hauv ancient Rome, thawj cov nyees khawm tau siv los ua cov khoom dai, thiab cov pins tau siv los khi cov khaub ncaws. Nyob rau hauv lub xyoo pua 13th, cov nyees khawm tau...