Given the transfer function G(s) of a system (3s+7)/(s(s+1)) A unit step u(t) is applied to the system’s input, then the time response y(t) is ( ).
A、y(t)= u(t) · (4+7t+4 e-t);
B、y(t)= u(t) · (2 + 7t + 7e-t);
C、y(t)= u(t) · (7 +4t + 4e-t) ;
D、y(t)= u(t) · (4 - 2t + e-t)
发布时间：2025-07-12 21:32:58
