Given a signal, [img=31x25]180337898503e1e.png[/img], whose waveform is shown below, the waveform of [img=35x26]180337898da438f.png[/img] is ( )[img=560x347]18033789b1adb02.bmp[/img]
A: [img=470x272]18033789ce221e1.bmp[/img]
B: [img=464x264]18033789edbf758.bmp[/img]
C: [img=442x265]1803378a066832b.bmp[/img]
D: [img=458x267]1803378a240c8b8.bmp[/img]
A: [img=470x272]18033789ce221e1.bmp[/img]
B: [img=464x264]18033789edbf758.bmp[/img]
C: [img=442x265]1803378a066832b.bmp[/img]
D: [img=458x267]1803378a240c8b8.bmp[/img]
举一反三
- 已知信号 x(t) 的波形如题12图所示，x'(t)的波形表示正确的是 ( ) [img=477x247]1802d53ea48b503.png[/img] A: [img=470x272]1802d53ec0f2147.bmp[/img] B: [img=464x264]1802d53ee2e9669.bmp[/img] C: [img=442x265]1802d53efbcafae.bmp[/img] D: [img=458x267]1802d53f1b74df8.bmp[/img]
- 1.设随机变量X的密度为[img=186x61]18034ea953ec9dd.png[/img]则常数A=________，概率[img=146x25]18034ea95d30d08.png[/img]__________. A: A=2，P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] B: A=-2，P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] C: A=2，P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img] D: A=-2，P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img]
- 设X与Y相互独立，均服从参数为1的指数分布，则P(X+Y<1) A: [img=84x24]18036de4b8088be.png[/img] B: [img=75x24]18036de4bf77b71.png[/img] C: [img=75x24]18036de4c8172a3.png[/img] D: =P(X<1)P(X<1) E: =P(X<0.5)+P(X<0.5) F: >P(X<1)
- 设X与Y相互独立，均服从参数为1的指数分布，则P(X+Y<1) A: [img=84x24]1803645ffb36da1.png[/img] B: [img=75x24]180364600306be0.png[/img] C: [img=75x24]180364600c8ab8b.png[/img] D: =P(X<1)P(X<1) E: =P(X<0.5)+P(X<0.5) F: >P(X<1)
- 设X与Y相互独立，均服从参数为1的指数分布，则P(X+Y<1) A: [img=84x24]18035b3d47a8410.png[/img] B: [img=75x24]18035b3d50597f9.png[/img] C: [img=75x24]18035b3d59275e6.png[/img] D: =P(X<1)P(X<1) E: =P(X<0.5)+P(X<0.5) F: >P(X<1)