   
   
 !"   
#$%&$%'(%)   
*+, /"0-1(   
2 34 "%56   
7 #%()"%56   
89:;8<8   
* =%&%%>"%56   
*%)?)   
** . @(A%"%56   
*2B%C-,DE"%F%    
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*H IDJ"   
*K=)L#   
38M;NBOPQ3R;QS;=T@U   
28%1V%WI    
2R/IX?)L#   
3RYB=;;   
3=TQS;3=ZT;;[   
=)IX   
=%()"%\   
3Q]=U^   
3B<B8_Q_BB`]   
8_Q_Ba<B[;;b;Bc   
AGd/%C"(5%1   
AG"#$%&$&-+"   
*5 /   

8_Q_B=T^eB;B=f89O   
8_Q_BR=g]9B3f]<Bh;     

o27;"w"WIX$A%3If$   
B&%6p"?%&q'3I   
o2HB%6p"%C'"rA'   
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o2‡f!%#%A%.%&'"r/"#"   
o2l|""|r/"#"   
o7fyx"r/"#"-}-|""|   
o7;+""|r/"#"d/&%%!(   
o7fyx""' r/"#"d/&$%VG€   
o7*3…u-&%4"%%ˆI5'"r/"#"   
AG ?)G &DI  L'   
AG?)G WI  #%   
AG?)G WI  $%G   
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3…%A%rŠ"8'R%   
!G+%A%%m%W%(>-+"rŠ"‹I'%a   
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*;%s"3Id/8Œ8   
2 B&%%x$G/%A%d/-D'd/  •   
8%xIx   
8%xIxR#"?Ž% d/&%"•%„Q'{   
 8%xIx;"w"WIX$A%3If$   
ˆ% nIDE   
B&-m->G%V%q'"w"W   
*B4s"w"W   
2fyx"3If$"3I   
*
73Vxyx"3f->Gw$%•"A%%C   
HB&-,DE"d/I %"3f   

•C%)$%r/–%x-+"
•%)FV%Fu%q-+""%!-+"%|Gu%.G–•I!d/&r!"
%|Gu%D'G!%!"n'(A%r/(Ž?)q'GA%
•B%D'-D'-DE–%nd/&)!(%.
•C%%D'r)$%Dn"$%&$->"#r/X$
•w%A%?%|D˜"DE"u&G–()d.D(O-|&G?%w"%>d…%A%u
†-)?%w"%>%/%/%r/X$
•8%x%(%%D'L'1G-)d %Cq'&G
••ž"Gw&Vu%D'|%A%#%FL'->&GL'&
•8%Dn"$%&$!(%Cq'&d5%D'$%&%(-DE%)?%#p"q'&GuG'"
m"IV%()u?%w""1(-DE%6"%s%CX$%f
;%DdX(u->?%€$%x%W"?%|?%pDˆG€d/"s$%C%|%W"?)L#%C
X$,%nuw%C"(5%1t8%Dn"$%&$!(%Cq'"&d5%D'$%&%(-DE%)
?%#p"q'&GuG'"m"IV%()u?%w""1(-DE%6"%s%CX$%&Gv->
?%€$%x% !"/(
7
0"(1(2342+356+37/
%w-,DE""#"!(q'%s"'I/%C%Iˆ$Hu&Gd‰'rDˆL'"'
-!>%CuV%%)?A–%.u?%#p"D(q'&G—"%D'-DE'u%D"
"DEI!&GIw%V%AG–?%&G$%&u€Gr€-DE1GIŽ/("DJ"&d5|%>
-.?%>)!(G+&%I%%!I/G%)%C%6"%s%n
>?%€$%x%W""(5%1-}5˜5uw|4%."#$%&$%D
• p"DJ"%!-+"%|G%&G%6"%s?%%C
• &d5I/Gr/X$G†%.I0%%C%L'&
• p"DJ"I/G&r/X$!Iˆ$
• Z50fd…%A%DˆF%Dˆ"†q'"&d5
• p"DJ"G+,r/X$˜%/->%C%I/G
• &d5%Dˆ"†%%C%&%$%1V%r/&
• D'–%nd/&)%CI/G%?%w"?%Vrz%Cwz
• B0!'G+GwDJ"%1% u"DJ"&d5?%w"5L&%&%'(C'

L2 *l 2 7 2 *7
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0"3(7+X7
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'&-+"ƒ
7+YF1
Bảng 2. (KZD3E*.<K[4D<\*3D4D*3]Z+SU*.<SU*.
 $;(D3E*. 3^D*.3()Z
&\"rA% u uH
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Gw#˜r#"*ƒ
Bảng 3.3(7+X7*.3(C*DEF
3]Z
+,SLD
$
4D<9*.
:5F
$
%F"% G
‚HRƒ
^
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x"$%0G.G3Id/‹I'%
^*
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k"7+YF1
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Kết quả khảo sát:


*
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'" 3@*+MD3OqR()F/
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N>:5F+4D<9*./
2
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-+"
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d "1(%6"%s%%C%rŠ"$%0G.G3II/Iˆ
3AdX("#%()-}-DE?>G%6"
0">*RFt*X7+YF1/
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%"&d5
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d/$%Dn" !(%C
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