Video: Cork nrhiav tau li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cork yog cov khoom siv tsis muaj dej tsis zoo, cov phellem txheej ntawm cov tawv ntoo uas tau sau rau kev lag luam siv feem ntau los ntawm Quercus suber (lub cork Oak), uas yog nyob rau sab qab teb sab hnub poob Europe thiab sab hnub poob Africa. Cork tau tshuaj xyuas microscopically los ntawm Robert Hooke, uas coj mus rau nws nrhiav pom thiab lub npe ntawm lub cell.
Nyob rau hauv no hais txog, leej twg invented cork?
Pib xyoo 1688, Pierre Perignon siv corks tuav nyob rau hauv qhov chaw nrog hlau mus foob fwj ntawm nws qhov tseeb creation, champagne. Xyoo 1892, cov khoom tsim tawm cork lined crown cap hau (zoo dua hu ua lub raj mis cap) tau tsim los ntawm Asmeskas William Painter , uas tau los ua neeg nplua nuj los ntawm nws qhov kev tsim khoom.
Kuj Paub, Cork ua li cas? Cork yog tsim los ntawm cov tawv ntoo ntawm ib Cork Ntoo Ntoo. Cov ntoo no feem ntau pom nyob rau hauv Mediterranean lub teb chaws xws li Spain thiab Portugal. Tsob ntoo ncav cuag maturity tom qab ib ncig ntawm 25 xyoo ntawm kev loj hlob. Thaum loj hlob tiav lawm, tshwj xeeb kev cob qhia cork Cov kws sau qoob yuav pib strip cov tawv ntoo siv ib tug axe.
Cork thawj zaug siv thaum twg?
Hauv 3000 BC, cork twb ua siv nyob rau hauv nuv ntses tackle nyob rau hauv Tuam Tshoj, Egypt, Babylon thiab Persia. Nyob rau hauv ltalis tseem niaj hnub txij li thaum xyoo pua 4th BC tau pom muaj xws li cov khoom qub xws li ntab, stoppers rau casks, poj niam khau thiab cov ntaub ntawv vov tsev.
Dab tsi yog siv ua ntej Cork?
Ua ntej txoj kev loj hlob ntawm corks rau lub raj mis sealants, ntaub los yog tawv yog qhov kev xaiv thawj, tom qab ntawd ua raws li av nplaum thiab sealing ciab. Nws tau tshaj tawm tias cork tej zaum yuav tau siv los ntawm Greeks thiab Loos, txawm hais tias nws tsis yog qhov kev xaiv kaw. iav yog siv ib tug sealer los ntawm 1500's.
Pom zoo:
Ua li cas koj thiaj nrhiav tau lub ntiajteb txawj nqus ntawm cov kua sib tov?
Tam sim no faib tag nrho qhov ceev los ntawm qhov ceev ntawm cov dej thiab koj tau txais SG ntawm qhov sib tov. Dab tsi yog cov kua uas muaj qhov ceev tshaj plaws? Thaum sib npaug ntawm ob yam khoom sib xyaw, qhov tshwj xeeb ntawm qhov sib tov yog 4. Ib qho loj ntawm cov kua ntawm qhov ntom ntom p yog tov nrog qhov sib npaug ntawm lwm cov kua ntawm qhov ntom ntom 3p
Yuav ua li cas koj thiaj nrhiav tau lub hauv paus 2 ntawm 10?
Log102 = 0.30103 (approx.) Lub hauv paus-10 logarithm ntawm 2 yog tus lej x xws li 10x = 2. Koj tuaj yeem xam logarithms los ntawm txhais tes siv qhov sib npaug (thiab faib los ntawm lub zog ntawm 10 - uas yog tus lej hloov pauv) thiab qhov tseeb tias log10(x10) = 10⋅log10x, txawm tias nws tsis yog qhov ua tau zoo heev
Yuav ua li cas koj nrhiav tau kab rov tav stretch?
Yog tias b> 1, daim duab ncab nrog kev hwm rau y -axis, lossis vertically. Yog hais tias b <1, daim duab shrinks nrog rau y -axis. Feem ntau, kab rov tav stretch yog muab los ntawm kab zauv y = f (cx) y = f (c x)
Yuav ua li cas koj thiaj nrhiav tau tus nqi ntawm tus qauv txhais tau tias?
Qhov xav tau tus nqi ntawm tus qauv txhais tau tias yog cov pej xeem txhais tau tias, thiab SE ntawm tus qauv txhais tau tias yog SD ntawm cov pej xeem, muab faib los ntawm lub hauv paus square ntawm tus qauv loj
Henri Becquerel nrhiav tau dab tsi uas ua rau nws tau txais 1903 Nobel nqi zog Nws nrhiav tau dab tsi txog lub caij uranium?
Teb: Henri Becquerel tau txais ib nrab ntawm qhov khoom plig rau nws qhov kev tshawb pom ntawm cov hluav taws xob tsis zoo. Teb: Marie Curie tau kawm txog cov hluav taws xob ntawm tag nrho cov tebchaw uas muaj cov xov tooj cua paub, suav nrog uranium thiab thorium, uas nws tom qab pom kuj tseem muaj xov tooj cua