S N α G G R R R A V G C L S α y/ cm x/ m 1 2 3 4 5 6 7 8 0 2 － 2 a O F C C F O CF O O FF O FF L,r R L B A R L,r C BA A 1 A 2 R 3 R 2 R 1 A B E 1 , r 1 E 2 , r 2 R A B A V A V m 2 m 1 A 1 C¸c kÝ tù ®Æc biÖt: Λ μ ρ ω ε φ Ω ºC ºF ´ º ∞ ≈ ≡ ≠ ~ √ ≤ ≥ + - ± × ÷ ∩ ║ ‰ ™ ∏ ∑ ® © η π θ γ β ↓ → ↑ 2 3 Phiªn ©m: ':[] A