Video: Peb puas siv tus qauv kub niaj hnub no?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
Cov kub standard tsis yog tam sim no siv los ntawm tsoom fwv. Tebchaws Askiv nres siv tus qauv kub Xyoo 1931 thiab Asmeskas tau ua raws li xyoo 1933 thiab tso tseg cov seem ntawm cov kab ke hauv xyoo 1973.
Ntawm no, peb puas muaj tus qauv kub niaj hnub no?
Tsis muaj lub tebchaws tam sim no thim nws cov txiaj ntsig nrog kub , tab sis ntau muaj yav dhau los, suav nrog Tebchaws Meskas; rau ib nrab xyoo pib xyoo 1879, cov neeg Asmeskas yuav pauv hauv $ 20.67 rau ib ooj kub . Lub teb chaws zoo tso tseg cov kub standard nyob rau hauv 1933, thiab tag nrho kev sib txuas ntawm cov nyiaj thiab kub hauv xyoo 1971.
Qhov thib ob, vim li cas tus qauv kub yog lub tswv yim phem? Cov kub standard ua rau nws nyuaj rau tsoomfwv kom nce nqi los ntawm kev nthuav cov nyiaj txiag. Hauv qab kub standard , tseem ceeb nce nqi yog tsawg, thiab hyperinflation yog qhov tseem ceeb tsis yooj yim sua vim hais tias cov nyiaj them tuaj yeem loj hlob ntawm tus nqi uas kub kev muab khoom nce.
Ntxiv mus, puas muaj lub teb chaws twg tseem siv tus qauv kub?
Hnub nyoog ntawm kub standard prominence tau dhau mus, txawm tias ntau lub nroog tseem khaws tseem ceeb kub reserves xws li US, Fabkis, Lub teb chaws Yelemees, Ltalis, Tuam Tshoj thiab Switzerland. Kub thiab US$ yeej ib txwm muaj kev sib raug zoo. Nyob rau lub sijhawm ntev, tus nqi poob qis feem ntau txhais tau tias nce kub tus nqi.
Puas yog tus qauv kub zoo?
Proponents ntawm lub kub standard sib cav nws muab kev ruaj ntseg nyiaj txiag ntev thiab kev loj hlob, tiv thaiv kev nce nqi, thiab yuav txo qhov loj ntawm tsoomfwv. Lawv hais tias a kub standard yuav txwv tsis pub muaj peev xwm ntawm tsoomfwv los luam cov nyiaj ntawm qhov xav tau, ua kom cov nyiaj tsis txaus, thiab nce cov nuj nqis hauv lub tebchaws.
Pom zoo:
Puas yog paj rwb gin siv niaj hnub no?
Tseem muaj paj rwb gins hnub no uas tam sim no siv rau kev sib cais thiab ua paj rwb. Paj Rwb gins tau hloov ntau xyoo txij li thaum Eli Whitney thawj tsim nws. Cov paj rwb gins uas tam sim no siv tau loj dua thiab muaj txiaj ntsig ntau dua txawm hais tias lawv tseem siv tib lub tswv yim
Peb txoj kev siv lub hnub ci tuaj yeem siv tau li cas?
Solar Energy Photovoltaic cells, uas hloov lub hnub ci rau hauv hluav taws xob. Hnub ci thermal tshuab, qhov twg tshav kub los ntawm lub hnub yog siv los ua dej kub los yog chav. Passive hnub ci cua sov, uas tuaj yeem yooj yim li cia lub hnub ci los ntawm qhov rais kom sov sab hauv lub tsev
Cov mortars puas tseem siv niaj hnub no?
Yog lawm. Mortars yog infantryman tus phooj ywg zoo tshaj plaws thiab tus yeeb ncuab phem tshaj (tshwj tsis yog cov mines). Thiab lawv yog cov pheej yig dua los ua ntau dua li cov phom loj, nqa tau yooj yim dua, thiab tuaj yeem xa hluav taws kub ceev heev. Mortars hloov pauv kev sib ntaus sib tua, ib yam li riam phom zoo li AA12 rab phom tua phom muaj nyob rau hauv tib tus txiv neej portable siab
Dab tsi yog lub hnub ci vaj huam sib luag zoo tshaj plaws ntawm kev ua lag luam niaj hnub no?
SunPower tsim cov kev ua haujlwm siab tshaj plaws monocrystalline solar panels muaj. Peb X22 muaj cov ntaub ntawv tawg ua haujlwm txog li 22.8 feem pua, ua rau nws ua tau zoo tshaj plaws ntawm kev ua lag luam niaj hnub no. Polycrystalline vaj huam sib luag efficiency feem ntau yog li ntawm 15 mus rau 17 feem pua
Puas yog cov dej zeb tseem siv niaj hnub no?
Tam sim no siv dej mills tseem siv rau kev ua qoob loo thoob plaws ntiaj teb tsim. Txawm hais tias muaj hluav taws xob pheej yig nyob rau hauv lub xyoo pua 20th thaum ntxov ua rau cov dej zeb tsis siv lawm, qee lub tshuab dej keeb kwm tseem ua haujlwm hauv Tebchaws Meskas