Nhiệt liệt
chào mừng
các thầy, cô
đến dự giờ
lớp 7A

VỤN SẮT,THÉP
CẦN CẨU

THỎI SẮT,THÉP
CẦN CẨU

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

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LMN#?A8!-
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  !"#$% 
#   !&'!()*+,-
  
./


P0+'C>A'AQ!"5CE!-
ChuôngChuông

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

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 !"'.*'R

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Hình 23.3
%'&!"'CE+-
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

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&;%73=
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1;%5234
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A4;
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#   
D0'=EFG
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5 
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LC6M!'!(

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