4-8 B,R Rn+ CC el R 470K R.470K R be2 1+B2 26 26 hl=fb+(+B),≈2001 E10 0.013 R B2R B R B IK A,=A.n×A B,R2. o 26 di d2 RB+rel β1xbB8g=Re+rhal R EE Rn tr4-8 1 1 2 2 2 2 1 1 2 1 1 1 2 1 2 2 2 2 1 1 1 2 2 2 1 1 2 1 1 0.013 26 2001 26 (1 ) 1 ' b e C b e b e C b e b e C b e i u d u d u d b e C u d E Q b e b b b e i b e i u d R r R r r R R r r R R r R A A A r R A I r r r R R r R A +   − +  + = −  + =  = − = = + +   + = + = − B B B B          