Video: Dab tsi yog thawj qhov hauv Internet?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
UCLA tus tub ntxhais kawm Charley Kline sim xa cov ntawv "login" mus rau lub computer ntawm Stanford ResearchInstitute dhau qhov ua ntej txuas ntawm ARPANET, uas yog qhov ua ntej rau niaj hnub Internet . Tom qab cov ntawv "l" thiab "o" raug xa mus rau lub kaw lus poob, ua rau ua ntej lus puas tau xa rau ntawm Internet “lo”.
Nyob rau hauv no hais txog, dab tsi yog thawj zaug nyob rau hauv Internet?
Cov ua ntej uploaded photo The earliest photo to puas tau kev hlub Internet yog qhov kev txhaj tshuaj no ntawm Les Horribles Cernettes - acomedy band raws li CERN lub chaw kuaj mob hauv Switzerland, qhov chaw TimBerners-Lee thiab nws pab pawg tau tibneeg hu tauj coob txhim kho thoob ntiaj teb. Web.
Qhov thib ob, leej twg xa thawj email thiab nws tau tshwm sim xyoo twg? Cov thawj email tau xa los ntawm Ray Tomlinson rau nws tus kheej hauv 1971. "Cov lus xeem tau tsis nco qab kiag li…. Feem ntau yuav yog ua ntej lus yog QWERTYIOP lossis ib yam dab tsi zoo sib xws, "nws hais. 2.
Hauv qhov no, thaum twg thawj daim duab tau muab tso rau hauv Is Taws Nem?
Qhov no duab ntawm Les Horribles Cernettes yog tus ua ntej Cov duab duab ntawm ib pab pawg tau luam tawm hauv WorldWide Web hauv xyoo 1992.
Thawj email puas tau xa tuaj hais li cas?
Cov ntawv ntawm qhov ntawd ua ntej electronic missiveconsisted ntawm "ib yam dab tsi zoo li QWERTYUIOP." Xa los ntawm computerengineer Ray Tomlinson nyob rau hauv 1971, lub email yog tsuas yog ib zaj lus tim khawv rau nws tus kheej.
Pom zoo:
Dab tsi yog qhov txawv ntawm daim ntawv pov thawj tus kheej thiab daim ntawv pov thawj CA?
Qhov kev ua haujlwm tseem ceeb ntawm daim ntawv pov thawj tus kheej kos npe thiab daim ntawv pov thawj CA yog tias nrog tus kheej kos npe, tus browser feem ntau yuav muab qee yam yuam kev, ceeb toom tias daim ntawv pov thawj tsis tau muab los ntawm CA. Ib qho piv txwv ntawm qhov yuam kev daim ntawv pov thawj tus kheej tau pom nyob rau hauv lub screenshot saum toj no
Dab tsi yog qhov dav thawj qhov kev tshawb fawb hauv kev txawj ntse?
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Dab tsi yog qhov dav thawj qhov kev tshawb nrhiav thiab qhov tob thawj qhov kev tshawb fawb?
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Dab tsi yog sparse kem Dab tsi yog qhov zoo thiab qhov tsis zoo?
Koj poob 4 bytes tsis yog ib zaug ib kab; tab sis rau txhua lub cell hauv kab uas tsis yog null. Qhov zoo ntawm SPARSE kem yog: Qhov tsis zoo ntawm SPARSE kem yog: SPARSE kem tsis tuaj yeem siv rau ntawm cov ntawv, ntext, duab, timestamp, geometry, geography lossis cov neeg siv cov ntaub ntawv teev tseg
Dab tsi yog qhov qub txeeg qub teg Dab tsi yog qhov sib txawv ntawm qhov qub txeeg qub teg piav nrog piv txwv?
Inheritance yog ib txoj hauv kev kom tau txais cov yam ntxwv thiab kev coj cwj pwm ntawm ib chav kawm los ntawm lwm chav kawm. Cov chav kawm uas cov tswv cuab tau txais qub txeeg qub teg yog hu ua chav kawm hauv paus, thiab chav kawm uas tau txais cov tswv cuab tam sim no hu ua chav derived. Inheritance siv IS-A kev sib raug zoo