2. 财务会计
  3. B. u(t) =-l(t-1)+2 * l(t-2)-l(t-3)V

B. u(t) =-l(t-1)+2 * l(t-2)-l(t-3)V

书海库2019-12-17  9
问题 B. u(t) =-l(t-1)+2 * l(t-2)-l(t-3)VC. u(t) = l(t-1)-l(t-2)VD. u(t) =-l(t+1)+l(t+2)-l(t+3)V
选项
答案B
解析提示：信号可以用函数来描述，此信号波形是伴有延时阶跃信号的叠加构成。
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