... djnh.
4- 3
:
Sun gac
Sin gac d~qc
C~U
tpa bdi he d4m vi bin chju tii trpng clia ngudi, trpng luqng cac
dung cy trang thie"t bj sd dung
-
San gac tqa 16n tudng hay cot th8ng qua d4m
- ... sinh vi he so" hut nhiet nh6
;
ngoai ra c6 mot st5
nai y&u c4u sin phii c6 khi nhg chBng thdm va phbng h6a tdt.
4- 4
:
Mai
01
-
Khai niem chung.
1
Muc dich,
y&u &u...
...
db
~ *4;
NHAV
C-W$
;L&
D%IIT
XA
Ntl4U
d
-
U&
8
.ud7
9
*
I
5
-
I
~5-6
~ih
KG
~iAn
vKa
c~;t
dL
.
Y
4-
y,H
= Do
cd2
.
F
3-
HW
CHACN
~INH
4. +4
tdO
su ...
'
~NG
4
T~UC
n.
fun
QUA*
-
L
-Q
SAW
rrgr,ig
)
/
Gid~
TRUC
3
'
3
.
d~
~d
4
TQUC
~
auv&
4;
m
h.
dk
LLb
l
I
Di
ftUl&
d
S4NH
di
:
45 O
I?...