1803dc15436878a.png is a random variable with PDF [img=174x27]1803dc154c4fcf0.png[/img], thenthe median of [img=15x19]1803dc15436878a.png[/img] is
A: [img=23x18]1803dc155e1a529.png[/img]
B: [img=39x26]1803dc1566755ee.png[/img]
C: [img=28x25]1803dc156f9cb92.png[/img]
D: [img=25x47]1803dc1577ca925.png[/img]
A: [img=23x18]1803dc155e1a529.png[/img]
B: [img=39x26]1803dc1566755ee.png[/img]
C: [img=28x25]1803dc156f9cb92.png[/img]
D: [img=25x47]1803dc1577ca925.png[/img]
举一反三
- 如图所示，真空中，矩形导体框架置于通有电流I的长直载流导线旁，且两者共面，AD边与直导线平行，DC段可沿框架平动，设导体框架的总电阻R始终不变。现DC段以速度v沿框架向下作匀速运动，则当DC运动到图示位置（与AB相距x）时，穿过ABCD回路的磁通量[img=22x23]18035e9bf631ab5.png[/img]为（ ）[img=228x311]18035e9c01eb7a0.png[/img] A: [img=95x44]18035e9c0fadb87.png[/img] B: [img=95x44]18035e9c1d5c33c.png[/img] C: [img=36x44]18035e9c2578181.png[/img] D: [img=93x44]18035e9c2e59f6e.png[/img]
- A continuous-time (C-T) periodic signal is shown below, then the components of the signal include ( )[img=634x330]180337809123d5d.bmp[/img] A: direct-current (DC) and cosine components of all harmonics B: DC and sine components of all harmonics C: DC and sine components of odd harmonics D: DC and cosine components of odd harmonics
- A continuous-time (C-T) periodic signal is shown below, then the components of the signal include ( )[img=634x330]17de808c88522e2.bmp[/img] A: direct-current (DC) and cosine components of all harmonics B: DC and sine components of all harmonics C: DC and sine components of odd harmonics D: DC and cosine components of odd harmonics
- 令F(x):x是有理数,G(x):x是实数。将命题“所有的有理数都是实数,但有的有实数不是有理数”符号化为() 未知类型：{'options': ['17e0a83a4157352.jpgx(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))'], 'type': 102}
- 在下列命题中:如果f(x)=[img=28x44]17e0bf9914bb2f1.png[/img],那么[img=27x29]17e0bf97582597b.png[/img]f(x)=0;如果f(x)=[img=28x44]17e0bf992111a1c.png[/img],那么[img=27x29]17e0bf97582597b.png[/img]f(x)=0;如果f(x)=[img=55x44]17e0bf992d8de0a.png[/img],那么[img=29x29]17e0bf9939482bb.png[/img]f(x)不存在;如果f(x)=[img=87x53]17e0bf99450fa82.png[/img],那么[img=27x29]17e0bf97582597b.png[/img]f(x)=0。其中错误命题的个数是( A: 0 B: 1 C: 2 D: 3