(1) A __________ A _______ ( )
(2) EF ___________________________
A B C D
(3) _______________
_________________
3
1 A _________________________________
2 B SO2 __________ B
_______________________
3 C ________________________
4 B D
_________________
4
(1) ( )
__________( )
, a________________________________________
____________________h( )
