3.已知信号 x(t) 的波形如题3图所示,可以表示为 ( )[img=547x283]1803879b419de95.png[/img]
A: (A) [img=118x25]1803879b4a31a92.png[/img]
B: (B)[img=87x25]1803879b527cd4d.png[/img]
C: (C)[img=159x25]1803879b5b9bab5.png[/img]
D: [img=128x25]1803879b6434add.png[/img]
A: (A) [img=118x25]1803879b4a31a92.png[/img]
B: (B)[img=87x25]1803879b527cd4d.png[/img]
C: (C)[img=159x25]1803879b5b9bab5.png[/img]
D: [img=128x25]1803879b6434add.png[/img]
举一反三
- 3.已知信号 x(t) 的波形如题3图所示,可以表示为 ( )[img=547x283]180361a696eaaf8.png[/img] A: (A) [img=118x25]180361a69f51404.png[/img] B: (B)[img=87x25]180361a6a7b5d4a.png[/img] C: (C)[img=159x25]180361a6afaaaf6.png[/img] D: [img=128x25]180361a6b8852fe.png[/img]
- 3.已知信号 x(t) 的波形如题3图所示,可以表示为 ( )[img=547x283]180370dd6b29a83.png[/img] A: (A) [img=118x25]180370dd7395f60.png[/img] B: (B)[img=87x25]180370dd7c02b6d.png[/img] C: (C)[img=159x25]180370dd843fc6c.png[/img] D: [img=128x25]180370dd8cd9440.png[/img]
- 3.已知信号 x(t) 的波形如题3图所示,可以表示为 ( )[img=547x283]18037811c5c2ba9.png[/img] A: (A) [img=118x25]18037811ceebabc.png[/img] B: (B)[img=87x25]18037811d8ff138.png[/img] C: (C)[img=159x25]18037811e142e8a.png[/img] D: [img=128x25]18037811ea88f93.png[/img]
- 3.已知信号 x(t) 的波形如题3图所示,可以表示为 ( )[img=547x283]18038bffdcb1b29.png[/img] A: (A) [img=118x25]18038bffe4ee9af.png[/img] B: (B)[img=87x25]18038bffed5d205.png[/img] C: (C)[img=159x25]18038bfff5a1572.png[/img] D: [img=128x25]18038bfffd72149.png[/img]
- 3.已知信号 x(t) 的波形如题3图所示,可以表示为 ( )[img=547x283]1803865f3f32dca.png[/img] A: (A) [img=118x25]1803865f4813a70.png[/img] B: (B)[img=87x25]1803865f50ba7dc.png[/img] C: (C)[img=159x25]1803865f59109aa.png[/img] D: [img=128x25]1803865f6135ac5.png[/img]