ȿȭ ǥ ϱ Ǹſ ̸ ϳ Ż ý ľϿ νϰ Ͽ ϴ ̴. ǵ濵 ڵ带 ̿ ,, αԴϴ. (ڵ̳,PDA) ̿ , , ս Ҽ ֽϴ. Ϲ ߿ ִ ,, α ڵ带 Ͽ .Ҹ ִ ǰ ǵ濵 ǰ ڵ带 ̿ , , ֵ Ǿ־ ֵ ý Ǿֽϴ.
2.ȿ
ǰ ãƼ ϴ ؼ ڵ带 ̿ Loss ϼ ,, ҿǴ ð 50%̻ ֽϴ.
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