Lub raj hais lus yog dab tsi yog nws siv?

Cov txheej txheem:

Lub raj hais lus yog dab tsi yog nws siv?
Lub raj hais lus yog dab tsi yog nws siv?
Anonim

noun. ib lub raj rau xa lub suab hla qhov deb me ntsis, raws li ib feem ntawm lub tsev lossis nkoj mus rau lwm qhov.

Tube tham yog dab tsi?

Ib lub raj hais lus, tseem hu ua megaphone lossis lub suab raj yogyooj yim, luv luv ntau yam khoom siv lub suab kis tau tus mob, muaj cov raj hlau lossis cov yeeb nkab ncab los ntawm ib qho chaw ruaj khov rau Lwm qhov, feem ntau nrog lub horn zoo li apertures ntawm ob qho kawg.

Cov raj hais lus ua haujlwm li cas?

Hauv tsev, lawv raug hu ua " hais lus ." Thawj qhov tsim tawm ntawm lub suab pipe muaj ob lub khob ntoo lossis hlau, ib qho kawg zoo li tus neeg hais lus lub qhov ncauj, txuas nrog rau lwm qhov uas ua rau lub suab nrov. … Dalnavert's speaking tube txuas chav ua noj rau Lady MacDonald's chav dej.

Leej twg tsim lub raj hais lus?

Tus kws tshawb fawb Askiv tus kws tshaj lij Jeremy Benthamtau thov kom suav nrog "kev sib tham" hauv kev tsim vaj tsev ntawm nws Panopticon (1787, 1791, 1811) thiab tom qab ntawd raws li kev sib txuas lus tub rog (1793) thiab thaum kawg raws li cov cuab yeej tsim nyog hauv architecture ntawm Ministry (1825).

Lub raj hais lus tau tsim thaum twg?

Cov raj hais lus hnub rov qab mus rau ncig 1849, thaum ib tsab xov xwm hauv Scientific American tau piav txog "acoustic telegraph" uas yuav ua rau tib neeg sib tham nrog phooj ywg "txog debraws li 60 mais deb" (!) ntawm lub raj ua los ntawm gutta percha (ib cov khoom latex tau los ntawm cov ntoo nyob rau sab hnub tuaj Asia).

Pom zoo:

Nthuav cov khoom
Koj puas tuaj yeem mus ntsib dagestan?
Nyeem ntxiv

Koj puas tuaj yeem mus ntsib dagestan?

Dagestan, officially lub koom pheej ntawm Dagestan yog ib lub koom pheej ntawm Russia nyob rau hauv lub Caspian Hiav txwv, nyob rau hauv lub North Caucasus ntawm Eastern Europe. Nws nyob rau sab qaum teb ntawm Greater Caucasus, thiab yog ib feem ntawm North Caucasian Federal District.

Xab npum suds siv rau dab tsi?
Nyeem ntxiv

Xab npum suds siv rau dab tsi?

A xab npum suds enema yog ib txoj hauv kev kho cem quav. Qee tus neeg kuj siv nws los kho fecal incontinence lossis tshem lawv cov quav ua ntej kev kho mob. Thaum muaj ntau hom enemas, xab npum suds enema tseem yog ib qho ntawm ntau hom, tshwj xeeb tshaj yog rau cem quav.

Puas yog qhov kev xeem thib ob?
Nyeem ntxiv

Puas yog qhov kev xeem thib ob?

Qhov thib ob derivative yuav yog siv los txiav txim siab hauv zos extrema ntawm kev ua haujlwm raws li qee yam xwm txheej. Yog tias qhov kev ua haujlwm muaj qhov tseem ceeb rau qhov twg f′(x)=0 thiab qhov thib ob derivative yog qhov zoo ntawm qhov no, ces f muaj qhov tsawg kawg nkaus hauv zos ntawm no.