半径为[img=14x19]1802f66212d35d7.png[/img]的半球形水池装满水(水的密度为1),现将水全部吸完,需要做功 = ( )
A: [img=159x52]1802f6621e22dbc.png[/img]
B: [img=139x52]1802f66227cf8a7.png[/img]
C: [img=92x52]1802f662309f98d.png[/img]
D: [img=92x52]1802f6623928022.png[/img]
A: [img=159x52]1802f6621e22dbc.png[/img]
B: [img=139x52]1802f66227cf8a7.png[/img]
C: [img=92x52]1802f662309f98d.png[/img]
D: [img=92x52]1802f6623928022.png[/img]
举一反三
- 半径为[img=14x19]1802ce0c22890ef.png[/img]的半球形水池装满水(水的密度为1),现将水全部吸完,需要做功 = ( ) A: [img=159x52]1802ce0c2cf2495.png[/img] B: [img=139x52]1802ce0c38f69f1.png[/img] C: [img=92x52]1802ce0c41472eb.png[/img] D: [img=92x52]1802ce0c4a1f149.png[/img]
- 半径为[img=14x19]1802e54805206e6.png[/img]的半球形水池装满水,现将水全部吸完,需要做功 = ( ) A: [img=159x52]1802e54810708bd.png[/img] B: [img=139x52]1802e5481ac4c8b.png[/img] C: [img=92x52]1802e548233aa37.png[/img] D: [img=92x52]1802e5482b64510.png[/img]
- 半径为[img=14x19]1802ce0971c7b95.png[/img]的半球形水池装满水,现将水全部吸完,需要做功 = ( ) A: [img=159x52]1802ce097b230cc.png[/img] B: [img=139x52]1802ce0986594ef.png[/img] C: [img=92x52]1802ce098f9b490.png[/img] D: [img=92x52]1802ce099831a26.png[/img]
- 设X的密度函数为f(x),分布函数为F(x),且f(x)是偶函数,则有 A: [img=235x53]1803b3ba8e4e24a.png[/img] B: [img=248x66]1803b3ba9822ce1.png[/img] C: F(−x)= F(x) D: F(−x)=2F(x)−1
- 设X的密度函数为f(x),分布函数为F(x),并且f(x)=f(-x)。那么对任意给定的a>0都有 A: [img=170x49]18038fe676863cb.png[/img] B: [img=176x49]18038fe680a68a4.png[/img] C: F(a)=F(-a) D: F(-a)=2F(a)-1