1/L 2 2 s+O s+O (s) C S 2 S+00S+00 若x(0)=0,则二.r的拉氏变换(s)=0(s)F(S) 1/L E/L 2 2 2 2 x(S)= s+0, s+O E S+O C 1/c 2 2 2 OSEG s-+0 s-+0 2 sS+O            + − + =                     + + + − + = = =             + + + − +  = ) 1 ( / 0 1 1/ 1/ 1/ ( ) (0) 0, . . ( ) ( ) ( ) 1/ 1/ ( ) 2 0 2 2 0 2 2 0 2 2 0 2 2 0 2 2 0 2 2 0 2 2 0 2 2 0 2 2 0 2             s s s E s E L s E L s c s c s L s s x s x z s r x s s F s s s s c s L s s s 若 则 的拉氏变换为