7.3 ???)8? 7 ?9,???? ???????0?(?0?8?????(?,???? 3,000 ??
???(0???????
?????? A = L + OE (P)
?(0???????
?8???)
??????3? ?,??????8?4?
7.4 ???)8? 10 ????4????0?7?? 2,000 ??
???(0???????
?????? A = L + OE (P)
?(0???????
?8???)
??????3? ?,??????8?4?
. ? ?
. ? ?