电路如图所示，其等效电路及参数为（）[img=185x208]1803519c4f7c54d.png[/img]
A: [img=249x143]1803519c5a9cdda.png[/img]
B: [img=231x136]1803519c669bfe4.png[/img]
C: [img=209x142]1803519c72bf72b.png[/img]
D: [img=245x157]1803519c7d7df60.png[/img]
A: [img=249x143]1803519c5a9cdda.png[/img]
B: [img=231x136]1803519c669bfe4.png[/img]
C: [img=209x142]1803519c72bf72b.png[/img]
D: [img=245x157]1803519c7d7df60.png[/img]
举一反三
- 电路如图所示，其等效电路及参数为（）[img=185x208]1803519c4f7c54d.png[/img] 未知类型：{'options': ['', '', '', ''], 'type': 102}
- 设X，Y为两个随机变量，且[img=179x25]1803395d555effc.png[/img] , [img=226x25]1803395d61f1a43.png[/img] ,则[img=143x25]1803395d6f00057.png[/img]= ( )． A: 1/7 B: 3/7 C: 4/7 D: 5/7
- Which of the following propositions is false,set A = {x,x is an integer and[img=60x23]1803a1c6eebb7a3.png[/img]} ? ( ) A: [img=113x25]1803a1c6f77ce06.png[/img] B: [img=139x25]1803a1c7001fe79.png[/img] C: [img=51x22]1803a1c70863f61.png[/img] D: {x|x is an integer and |x| 4}[img=33x22]1803a1c711a7c63.png[/img]
- Which of the following propositions is false,set A = {x,x is an integer and [img=60x23]1803a1c503ffa04.png[/img]} ? ( ) A: [img=113x25]1803a1c50cc3162.png[/img] B: [img=139x25]1803a1c514e60ea.png[/img] C: [img=51x22]1803a1c51dd52ef.png[/img] D: {x|x is an integer and |x| <4} [img=33x22]1803a1c525cf1bd.png[/img]
- 随机变量X服从正态分布N(2, 4)，其概率密度f(x) = ( ). A: [img=191x60]1802f2ad96fdbf7.png[/img] B: [img=220x63]1802f2ada0bf186.png[/img] C: [img=221x63]1802f2adabac400.png[/img] D: [img=212x57]1802f2adb8ce515.png[/img]