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revision st Flashcards

1
Q

pergelisol?

A

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

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2
Q

conseuqnece du pergelisol?

A

inondations glissement de terrain fonte de banquise

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3
Q

premiere famille

A

alcalins

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4
Q

deuxieme famille

A

alcalino terreux

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5
Q

3 famille

A

halogenes

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6
Q

4 famille

A

gaz inerte

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7
Q

durete

A

resister a la deformation et penetration

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8
Q

rigiditer

A

garder sa forme

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9
Q

elasticite

A

deformation puis reprendre sa forme

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10
Q

ductillite

A

deformation irreversible

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11
Q

malleabillite

A

sapplatir sans se rompre

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12
Q

fragilite

A

casser avant de se deformer

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13
Q

resillience

A

resister au chocs et reprendre sa forme

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14
Q

roue de friction

A

reversible

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15
Q

engrenages

A

reversibles

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16
Q

courroie et poullies

A

reversible

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17
Q

chaines et roues dentees

A

reversible

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18
Q

roue dentees et vis sans fin

A

non reversible

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19
Q

pignon et cramaieller

A

reversible

20
Q

bielle et manivelle

A

reversible

21
Q

manivelle a coulisse

A

reversible

22
Q

came tige poussoir

A

non reversible

23
Q

degradation ceramique

A

acides ou bases fort, choc thermique

24
Q

protection ceramique

A

aucun

25
Q

degradation plastiques

A

uv, oxydations

26
Q

protection palstiques

A

pigments qui absobent uv, revetemnt impermeable

27
Q

degradation bois

A

insectes humidite

28
Q

protection bois

A

peindre les chuaffer les huiler

29
Q

les metaux degradation

A

la corrosion(rouille)

30
Q

les metaux protection

A

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

31
Q

liason directe

A

sans organe de lisaon

32
Q

liason indirecte

A

avec des organes de liason

33
Q

liasons demontable

A

separer sans endommager

34
Q

liasons indemontable

A

separer mais endommager

35
Q

liason rigide

A

organge de liason rigidelia

36
Q

liason elastique

A

lorgane de lisaon et deformable

37
Q

liason complete

A

les pieces peucent pas bouger indepandamment

38
Q

liason partielle

A

une peut pouger sans lautrec

39
Q

courant continu

A

pile et batterie

40
Q

courant alternatif

A

generatrice ou prise de courant

41
Q

fonction de conduction

A

permet le passage du circuit

42
Q

fonction disolation

A

empeche le passage du courant

43
Q

donction de protection

A

coupe le courant quand e circuit marche pas

44
Q

materiaux ferromagnetiques

A

fer,nickel,cobaltc

45
Q

courant de surface

A

vent et rotation de terr

46
Q

courant de profondeur

A

differnce de slalinite et temperature

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