已知电池 (1) Cu│Cu[img=18x25]1802d36a00b1b34.png[/img]([img=16x17]1802d36a1058699.png[/img])‖Cu[img=18x25]1802d36a00b1b34.png[/img]([img=16x17]1802d36a20e2d64.png[/img])│Cu 电动势为[img=20x22]1802d36a28ac441.png[/img] ; (2) (Pt)│Cu[img=18x25]1802d36a00b1b34.png[/img]([img=16x17]1802d36a1058699.png[/img]),Cu[img=18x25]1802d36a00b1b34.png[/img]([img=14x21]1802d36a49149aa.png[/img])‖Cu[img=18x25]1802d36a00b1b34.png[/img]([img=16x17]1802d36a20e2d64.png[/img]),Cu[img=11x21]1802d36a60b4676.png[/img]([img=14x21]1802d36a49149aa.png[/img])│(Pt) 电动势为 [img=20x22]1802d36a719a282.png[/img],则: ( )
A: [img=91x25]1802d36a7aa05f6.png[/img]
B: [img=73x22]1802d36a82c9358.png[/img]
C: [img=64x22]1802d36a8ae8d15.png[/img]
D: [img=64x22]1802d36a93d4b7e.png[/img]
A: [img=91x25]1802d36a7aa05f6.png[/img]
B: [img=73x22]1802d36a82c9358.png[/img]
C: [img=64x22]1802d36a8ae8d15.png[/img]
D: [img=64x22]1802d36a93d4b7e.png[/img]
举一反三
- 已知电池 (1) Cu│Cu[img=18x25]1802d367e4257d6.png[/img]([img=16x17]1802d367ed7fea7.png[/img])‖Cu[img=18x25]1802d367e4257d6.png[/img]([img=16x17]1802d367fd1dfbc.png[/img])│Cu 电动势为[img=20x22]1802d3680525b81.png[/img] ; (2) (Pt)│Cu[img=18x25]1802d367e4257d6.png[/img]([img=16x17]1802d367ed7fea7.png[/img]),Cu[img=18x25]1802d367e4257d6.png[/img]([img=14x21]1802d36828d389f.png[/img])‖Cu[img=18x25]1802d367e4257d6.png[/img]([img=16x17]1802d367fd1dfbc.png[/img]),Cu[img=11x21]1802d36842312e2.png[/img]([img=14x21]1802d36828d389f.png[/img])│(Pt) 电动势为 [img=20x22]1802d36852eb403.png[/img],则: ( ) A: [img=91x25]1802d3685b3e61f.png[/img] B: [img=73x22]1802d36863f3bf5.png[/img] C: [img=64x22]1802d3686be522b.png[/img] D: [img=64x22]1802d3687456d46.png[/img]
- D(X)=25,D(Y)=36,[img=58x17]17e0c5b1a8ccbe4.jpg[/img],则D(X+Y)=(),D(X-Y)=()
- 设D(X)=25,D(Y)=36,[img=58x17]17e0bcfc3a8fb71.jpg[/img],则D(X+Y)=( ) A: 61 B: 85 C: 37 D: 57
- 设随机变量（X,Y）的联合密度函数为 [img=296x65]180348098079cc8.png[/img],则概率P{X>=3,Y<=2}=? A: 1/6 B: 1/36 C: 1/96 D: 7/128
- 设随机变量（X,Y）的联合密度函数为[img=296x65]1803480cc787bae.png[/img],则概率P{X=3,Y=2}=? A: 1/6 B: 1/36 C: 1/96 D: 7/128