![Thaum twg iav tau tsim? Thaum twg iav tau tsim?](https://i.tvmoviesgames.com/preview/questions/17894633-when-were-mirrors-invented-j.webp)
2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Reflective nto ua los ntawm polished obsidian yog cov qub "daim iav" nyob rau hauv cov ntaub ntawv archaeological, yos rov qab txog 4000 BCE. Thawj cov ntaub ntawv pov thawj ntawm iav raws li cov cuab yeej tu cev hnub rau xyoo pua 5 BCE, hauv cov duab kos duab ntawm cov neeg Greek zoo nkauj ntsia ntawm tes iav (cov duab kos no pom muaj nyob rau hauv cov tais diav qub).
Lawv siv dab tsi ua ntej iav?
Nyob rau hauv ib qho excerpt rau Lapham's Quarterly, Mortimer qhia zaj dab neeg li no: Ua ntej iav tsom iav, qhov zoo tshaj plaws uas koj ua tau yog tooj liab lossis tooj liab, tab sis cov iav no tsuas pom 20 feem pua. ntawm lub teeb thiab tau super kim. Yog li ntawd rau feem ntau cov neeg nyob nruab nrab, lawv tus cwj pwm raug tso tseg rau qhov pom hauv dej.
Daim iav puas muaj nyob hauv Nruab Nrab Hnub nyoog?
Nyob rau nruab nrab hnub nyoog, daim iav tsis tau pom raws li cov khoom siv sib xws. Hloov chaw, lawv yog ib qho qhia txog xwm txheej. Thaum ntxov, daim iav rooj plaub tau pom tias yog cov duab kos duab - tsis yog lub ntsiab lus ntawm kev pom ib qho kev xav. Daim iav rooj plaub muaj ib daim iav encapsulated nyob rau hauv ob lub tiaj tiaj discs.
Thaum twg iav tau dhau los ua hauv tsev?
iav iav tau tsim thawj zaug thaum xyoo pua thib peb AD, thiab muaj ntau heev hauv tebchaws Iziv, Gaul, Lub Tebchaws Yelemees thiab Asia. Txoj kev tsim kho ntawm iav tshuab thaum lub xyoo pua 14th coj mus rau kev tshawb pom ntawm cov iav iav, uas ua rau muaj koob meej ntawm iav iav…
daim iav qub tshaj plaws li cas?
Nrhiav: Qhov ntxov tshaj plawspaub cov iav uas tsim los (kwv yees li 8000 xyoo) tau pom nyob rau hauv Anatolia (sab qab teb nruab nrab niaj hnub Turkey). Cov no tau tsim los ntawm obsidian (volcanic iav), muaj lub ntsej muag convex thiab zoo kawg nkaus kho qhov muag zoo.
Pom zoo:
Thaum twg cov tsom iav siv tau?
![Thaum twg cov tsom iav siv tau? Thaum twg cov tsom iav siv tau?](https://i.tvmoviesgames.com/preview/questions/17841201-when-were-hourglasses-used-j.webp)
Lub moos moos tau tshwm sim thawj zaug hauv Tebchaws Europe hauv lub yim xyoo pua, thiab tej zaum tau tsim los ntawm Luitprand, ib tug mlom ntawm lub tsev teev ntuj hauv Chartres, Fabkis. Los ntawm thaum ntxov xyoo pua kaum plaub, cov xuab zeb iav tau siv nyob rau hauv ltalis.
Leej twg yog lub neej dhau los ntawm cov iav tsom iav?
![Leej twg yog lub neej dhau los ntawm cov iav tsom iav? Leej twg yog lub neej dhau los ntawm cov iav tsom iav?](https://i.tvmoviesgames.com/preview/questions/17868186-who-is-life-through-rose-tinted-glasses-j.webp)
Cov kab lus "pom lub ntiaj teb los ntawm cov iav rose-tinted" yog hais txog cov tib neeg uas muaj lub siab xav pom txhua yam hauv qhov pom kev zoo, txawm tias qhov teeb pom kev tsis muaj tseeb. Qee tus uas nyiam pom tej yam uas muaj lub hom phiaj zoo dua thiab qhov tseeb yuav ua rau pom qhov tsis zoo ntawm lub neej no.
Thaum twg tau ya pob tw tau tsim?
![Thaum twg tau ya pob tw tau tsim? Thaum twg tau ya pob tw tau tsim?](https://i.tvmoviesgames.com/preview/questions/17869093-when-were-flying-buttresses-invented-j.webp)
Raws li kev txhawb nqa sab nraud, lub dav hlau ya tau tsim tawm thaum lub sijhawm qub qub thiab tom qab ntawd tau vam meej nyob rau lub sijhawm Gothic lub sijhawm Gothic lub sijhawm Gothic kos duab yog a style ntawm medieval art uas tau tsim nyob rau sab qaum teb Fabkis tawm ntawm Romanesque art nyob rau hauv lub xyoo pua 12th AD, coj los ntawm kev txhim kho ntawm Gothic architecture.
Lub iav twg yog lub iav tsav thiab qhov twg yog lub iav tsav?
![Lub iav twg yog lub iav tsav thiab qhov twg yog lub iav tsav? Lub iav twg yog lub iav tsav thiab qhov twg yog lub iav tsav?](https://i.tvmoviesgames.com/preview/questions/17874877-which-gear-is-the-drive-gear-and-which-is-the-driven-gear-j.webp)
Daim ntawv yooj yim tshaj plaws yog ob lub iav log nrog cov hniav meshing. Nyob rau hauv tag nrho cov gearbox ib lub iav yuav powered. Qhov no hu ua lub iav tsav thiab lwm lub iavyog hu ua lub iav tsav. Lub iav twg yog lub iav tsav? Gear trains with two gears Qhov yooj yim piv txwv ntawm lub tsheb ciav hlau muaj ob lub zog.
Thaum twg iav tsim?
![Thaum twg iav tsim? Thaum twg iav tsim?](https://i.tvmoviesgames.com/preview/questions/17903410-when-is-glass-manufactured-j.webp)
Ntseeg nws los tsis yog, iav yog ua los ntawm cov xuab zeb ua kua. Koj tuaj yeem ua iav los ntawm cua sov cov xuab zeb (uas feem ntau yog ua los ntawm silicon dioxide) txog thaum nws yaj thiab hloov mus ua kua. Koj yuav tsis pom qhov tshwm sim ntawm koj lub puam hauv zos: