revision st Flashcards by KaanAb1 KaanAb1

Q

pergelisol?

A

Partie du sol considere comme gele en permanance`pendant au moin s deux ans

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Q

conseuqnece du pergelisol?

A

inondations glissement de terrain fonte de banquise

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Q

premiere famille

A

alcalins

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Q

deuxieme famille

A

alcalino terreux

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Q

3 famille

A

halogenes

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Q

4 famille

A

gaz inerte

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Q

durete

A

resister a la deformation et penetration

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Q

rigiditer

A

garder sa forme

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Q

elasticite

A

deformation puis reprendre sa forme

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Q

ductillite

A

deformation irreversible

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Q

malleabillite

A

sapplatir sans se rompre

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Q

fragilite

A

casser avant de se deformer

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Q

resillience

A

resister au chocs et reprendre sa forme

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Q

roue de friction

A

reversible

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Q

engrenages

A

reversibles

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Q

courroie et poullies

A

reversible

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Q

chaines et roues dentees

A

reversible

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Q

roue dentees et vis sans fin

A

non reversible

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Q

pignon et cramaieller

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A

reversible

Q

bielle et manivelle

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A

reversible

Q

manivelle a coulisse

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A

reversible

Q

came tige poussoir

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A

non reversible

Q

degradation ceramique

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A

acides ou bases fort, choc thermique

Q

protection ceramique

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A

aucun

degradation plastiques

uv, oxydations

protection palstiques

pigments qui absobent uv, revetemnt impermeable

degradation bois

insectes humidite

protection bois

peindre les chuaffer les huiler

les metaux degradation

la corrosion(rouille)

les metaux protection

revetement passif, recouvrir de couche de metal qui offre un protection electrochimique

liason directe

sans organe de lisaon

liason indirecte

avec des organes de liason

liasons demontable

separer sans endommager

liasons indemontable

separer mais endommager

liason rigide

organge de liason rigidelia

liason elastique

lorgane de lisaon et deformable

liason complete

les pieces peucent pas bouger indepandamment

liason partielle

une peut pouger sans lautrec

courant continu

pile et batterie

courant alternatif

generatrice ou prise de courant

fonction de conduction

permet le passage du circuit

fonction disolation

empeche le passage du courant

donction de protection

coupe le courant quand e circuit marche pas

materiaux ferromagnetiques

fer,nickel,cobaltc

courant de surface

vent et rotation de terr

courant de profondeur

differnce de slalinite et temperature