Cov txheej txheem:
Video: NFPA 704 sawv cev rau dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
1. 2. W. TIAB SA 704 : Cov Txheej Txheem Txheej Txheem rau Kev Qhia Txog Cov Khoom Siv Hluav Taws Xob rau Kev Tiv Thaiv Thaum Muaj Xwm Ceev yog tus qauv tswj hwm los ntawm US-based National Fire Protection Association.
Yog li ntawd, NFPA 704 txhais li cas?
NFPA 704 yog ib daim ntawv sau npe siv los txheeb xyuas cov khoom phom sij. Nws yog luam tawm los ntawm National Fire Protection Association ( NFPA ). NFPA 704 yog ib qho kev sau npe ntxiv tshwj xeeb tshwj xeeb rau cov neeg muaj xwm txheej ceev, txawm tias lwm tus neeg ua tau nyeem thiab tau txais txiaj ntsig los ntawm cov ntawv no hauv kev ua haujlwm ib txwm muaj.
Kuj Paub, qhov ntsuas qhov ntsuas hluav taws xob ntawm 1 txhais li cas? Qib 1 - Cov ntaub ntawv uas yog feem ntau ruaj khov, tab sis ua tawg ntawm qhov kub thiab txias siab. ? Qib 0 – Cov ntaub ntawv uas yog ruaj khov txawm nyob rau hauv raug rau hluav taws . Tshuaj lom neeg kev ntaus nqi nyob rau theem siab tshaj yuav tsum muab rau ib chav yog tshuaj yog tam sim no nyob rau hauv qhov ntau ntawm tsib (5) nkas loos lossis ntau dua.
Ib yam li ntawd, tib neeg nug, plaub xim hauv NFPA pob zeb diamond txhais li cas?
Cov NFPA pob zeb diamond muaj plaub xim -coded teb: xiav, liab, daj, thiab dawb. Cov xim xiav, liab, thiab daj-uas sawv cev rau kev noj qab haus huv phom sij , flammability, thiab reactivity, ntsig txog-siv tus lej ntsuas ntawm 0 mus rau 4. Lub teb dawb yog siv los qhia txog kev phom sij tshwj xeeb.
Koj nyeem NFPA pob zeb diamond li cas?
Yuav Ua Li Cas Nyeem NFPA Pob Zeb Diamond
- Red Section: Flammability. Cov xim liab-xim ntawm NFPA Pob Zeb Diamond nyob rau sab saum toj lossis kaum ob teev ntawm txoj haujlwm ntawm lub cim thiab qhia txog cov khoom siv hluav taws xob thiab ua rau muaj hluav taws kub thaum raug tshav kub.
- Yellow Section: Instability.
- Blue Section: Health Hazards.
- Dawb Ntug: Kev ceev faj tshwj xeeb.
Pom zoo:
C sawv cev rau dab tsi hauv daim qauv?
Standard Form: daim ntawv qauv ntawm ib kab yog nyob rau hauv daim ntawv Ax + By = C qhov twg A yog ib tug zoo integer, thiab B, thiab C yog integers
Dab tsi yog cov xim muaj nyob rau hauv daim ntawv qhia kev phom sij rau kev noj qab haus huv hauv NFPA 704?
NFPA 704 pob zeb diamond kos npe siv los tso saib cov ntaub ntawv no muaj plaub ntu xim: xiav, liab, daj, thiab dawb. Txhua ntu yog siv los txheeb xyuas ib pawg sib txawv ntawm qhov muaj peev xwm txaus ntshai. Ntu xiav ntawm NFPA xim code cim qhia txog kev phom sij rau kev noj qab haus huv
Dab tsi cov tshuaj tiv thaiv sawv cev rau lub cev qhuav dej synthesis?
Nyob rau hauv lub cev qhuav dej synthesis cov tshuaj tiv thaiv (Daim duab), cov hydrogen ntawm ib tug monomer ua ke nrog cov hydroxyl pawg ntawm lwm monomer, tso ib tug molecule ntawm dej. Nyob rau tib lub sijhawm, cov monomers sib koom electrons thiab tsim covalent bonds. Raws li cov monomers ntxiv koom nrog, cov saw hlau ntawm kev rov ua dua monomers tsim ib lub polymer
Dab tsi yog qhov tseeb ntawm lub cev lub cev lub cev kev xav xav?
Lub cev lub cev lub ntsiab lus kev xav (PSSH) yog ib txoj hauj lwm hauv lub tswv yim ntawm kev txawj ntse tsim los ntawm Allen Newell thiab Herbert A. 'Ib lub cim lub cev muaj qhov tsim nyog thiab txaus txhais tau tias rau kev ua haujlwm ntse.'
SFA sawv cev rau dab tsi ntawm lub cev muaj zog?
Service Factor Amps, los yog S.F.A., sawv cev rau tus nqi tam sim no lub cev muaj zog yuav kos thaum khiav ntawm tag nrho Service Factor. Hauv qhov piv txwv nameplate, S.F.A. yog yim amps ntawm 230 volts. Txuas ntxiv tshaj S.F.A. qhia rau ntawm daim ntawv teev npe tuaj yeem ua lub neej luv luv