Nkaum xov xwm
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Cov kws tsav dav hlau American Airlines tau tshaj tawm pom "cov khoom cylindrical ntev" ya hla lub dav hlau
Ib tug kws tsav dav hlau American Airlines tau tshaj tawm tias thaum lub dav hlau ya hla New Mexico, nws pom "ib lub cylindrical ntev" strikingly ze rau lub dav hlau.FBI tau hais tias nws paub txog qhov xwm txheej, uas tshwm sim ntawm lub davhlau los ntawm Cincinnati mus rau Phoenix hnub Sunday.Raws li Tsoom Fwv Teb Chaws Aviation ...Nyeem ntxiv -
Urbanization thiab economic transformation yog tib yam
Kev hloov pauv hauv nroog thiab kev lag luam yog qhov sib npaug, thiab Tuam Tshoj lub raj txhuas (Pneumatic lub tog raj kheej raj) kev sib sib zog nqus tau nkag mus rau kaum xyoo golden.Cov kev paub keeb kwm qhia tau hais tias kev hloov pauv ntawm cov qauv kev lag luam kev lag luam yuav ua rau muaj kev hloov pauv hauv qhov tob hauv cov hlau cons ...Nyeem ntxiv -
HUP lub p-tube system ua kom cov kev pabcuam ua haujlwm zoo li qub
Lub Pneumatic Tube System ntawm University of Pennsylvania Tsev Kho Mob (HUP) thauj ze li ntawm 4,000 tus qauv, cov khoom siv ntshav thiab ntshav, thiab lwm yam khoom siv thiab cov tshuaj uas xav tau sai sai rau cov chaw thoob plaws hauv HUP lub tsev kawm ntawv ntawm qhov ceev ntawm 22 ko taw ib ob - kwv yees li 15 mais ib teev. &#...Nyeem ntxiv