一个零状态的线性时不变系统，单位冲激响应为 h0(t)，当系统激励为 f0(t)时，响应为 y0(t)，且 h0(t)，f0(t) 都是实函数，则当 f(t) = f0(t) – f0(t-1)，h(t) = h0(t) 时的零状态响应为（）。A:f0(t) – f0(t-1) B:h0(t) – h0(t-1) C:y0(t) – y0(t-1) D: f0(t)* h0(t)– f0(t-1)* h0(t) 答案: y0(t) – y0(t-1); f0(t)* h0(t)– f0(t-1)* h0(t)