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3、$/ /4M qo 5 sX;, ); V /; q s? 0b T aK bW Kv s0 $ he1 b 12/24/02 25 s + y b A o.loV TJOZDPT b 9V a) t 0 H _Q_. o v+(z,t) v-(z,t) $e d FZEb b) t = 0 H Y. LWz = 1m ) 71u 7b t = 10-9 H Y71P. L 0 z 1 v(zt)miFSb 5 8. (25/200 s ) A 1L b H LW 1cmi I = 3 a. Z_MQ m Ub a) =HLBHL) 3H O ) $i xyz US“b b) TBHL H O Nm-1 ? A c) 3 B L = Ap2 p V x m UbT pf T O G N $ 12/24/02 3
