2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Thawj zaug kaw cov roj kab rov tav, drilled ze Texon, Texas, tau ua tiav hauv 1929. Lwm qhov tau xyaum ua hauv xyoo 1944 hauv Franklin Heavy Oil Field, Venango County, Pennsylvania, ntawm qhov tob ntawm 500 feet. Tuam Tshoj sim kab rov tav drilling thaum ntxov li 1957, thiab tom qab ntawd lub Soviet Union kuj sim cov txheej txheem.
Thaum twg yog kab rov tav drilling tsim?
Thawj patent rau kab rov tav drilling txheej txheem tau tawm hauv 1891. Daim ntawv thov tseem ceeb yog rau kev ua haujlwm kho hniav tab sis tus neeg thov tau sau tseg tib cov txheej txheem tuaj yeem siv rau kev ua haujlwm hnyav. Thawj qhov tseeb cov roj kab rov tav tau drilled hauv Texas hauv xyoo 1929. Lwm qhov tau drilled hauv Pennsylvania xyoo 1944.
Yuav muaj pes tsawg lub qhov dej drilled?
Hydraulic fractured kab rov tav qhov dej tau suav rau feem ntau ntawm tag nrho cov qhov dej tshiab tau tho thiab ua tiav txij li xyoo 2014. Raws li xyoo 2016, kwv yees li 670,000 ntawm 977, 000 qhov tsim tau. hydraulically tawg thiab horizontally drilled.
Leej twg tsim kab rov tav drilling?
Txoj kev, qhov kev loj hlob ntawm cov roj zoo drilling tshuab, tau tshaj tawm thawj zaug tsim thaum xyoo 1970 los ntawm Titan Construction, ntawm Sacramento, California.
Vim li cas cov qhov dej kab rov tav tau drilled?
Npaj thaj tsam ntawm qhov dej uas tso cai rau cov kua dej ntau ntws mus rau hauv lub qhov dej vim ntau lub pob zeb nyob rau ntawm ntug ntawmlub qhov dej. Txhim kho cov khoom tsim tau ntawm cov pob txha pob txha los ntawm kev khawb hauv ib txoj hauv kev uas cuam tshuam qhov ntau tshaj plaws ntawm cov pob txha tawg ntawm cov roj thiab cov pa nkag mus rau hauv qhov dej tau txhawb nqa.
Pom zoo:
Thaum muab piv cov kab kab kab thiab cov kab ntsig flatworms qhov twg muaj tseeb?
Ib tug flatworm muaj nyias, dorsoventrally flattened lub cev. Roundworms yog ntau cylindrical hauv cov duab thiab tapered mus rau qhov zoo ntawm ib kawg. Ib yam li ntawd, cov kab mob roundworms muaj ib txheej txheej txheej hu ua cuticle uas lawv tau rov ua dua thoob plaws hauv lawv lub neej thiab thaum lawv loj hlob.
Qhov twg yog qhov laj thawj tseem ceeb rau kev thim rov qab / tig rov qab lub tswv yim?
Lub hom phiaj yog txo cov nqi, ua kom cov haujlwm ua haujlwm zoo, lossis ua kom cov nyiaj ntsuab ntws ruaj khov. Peb lub hom phiaj tseem ceeb ntawm kev thim rov qab yog: Txoj Cai Hloov Kho - Qhov no yog lub tswv yim tsim kho dua tshiab. Nws hu kom rov kho cov haujlwm kom tau nyiaj ntau dua lossis tau txais txiaj ntsig.
Cov kab kab kab kab kab ua kab mob txaus ntshai npaum li cas?
Nyob rau hauv peb thiab tom ntej instars ntawm lawv txoj kev loj hlob, Pine processionary caterpillars yog mob heev rau daim tawv nqaij ntawm tib neegthiab lwm yam tsiaj. Kev sib cuag yooj yim nrog cov plaub hau ntawm kab ntsig tuaj yeem ua rau pob khaus hnyav (urticaria) thiab khaus qhov muag, thiab qee tus neeg yuav muaj kev fab tshuaj.
Puas yog qhov nkhaus puas muaj kab rov tav tangents?
Peb tab tom nrhiav qhov txiaj ntsig ntawm x qhov twg y'=0, lub ntsiab lus tangent yog kab rov tav. Txij li qhov no yog qhov tseeb tsis tseeb, tsis muaj kev daws teeb meem, yog li, tsis muaj kab rov tav tangents. Koj ua li cas qhia qhov nkhaus tsis muaj kab rov tav tangents?
Puas kab kab rov tav puas muaj txoj kab nqes?
Ib kab kab rov tav muaj nqes xoom vim nws tsis nce vertically (ie y 1 − y 2 =0), hos ib txoj kab ntsug tsis tau txhais txoj kab nqes vim nws tsis khiav horizontally (x 1 − x 2=0). … Vertical kab yog cim sawv cev los ntawm qhov sib npaug, x=a qhov twg a yog x-intercept.
