设自旋卫星为理想刚体，其自旋轴为x轴，则其自旋稳定的条件是
A: [img=114x25]1802ce4bc1acdbc.png[/img]
B: [img=114x25]1802ce4bca8c1ad.png[/img]
C: [img=91x25]1802ce4bd2475d0.png[/img]
D: [img=91x25]1802ce4bdadc92f.png[/img]
A: [img=114x25]1802ce4bc1acdbc.png[/img]
B: [img=114x25]1802ce4bca8c1ad.png[/img]
C: [img=91x25]1802ce4bd2475d0.png[/img]
D: [img=91x25]1802ce4bdadc92f.png[/img]
举一反三
- 求不定积分[img=121x54]17da653839aa6ae.png[/img]； （ ） A: log(x^2 + 3*x + 25/4)/4 + (5*atan(x/2 + 3/4))/4 B: log(x^2 + 3*x + 25/4)/4 C: (5*atan(x/2 + 3/4))/4 D: log(x^2 + 3*x + 25/4)/4 - (5*atan(x/2 + 3/4))/4
- 若f(x)在[-1,1]上连续，其平均值为2，则[img=110x72]17e0b396e26d256.png[/img](). A: 1/4 B: -1 C: 4 D: -4
- 设二维随机变量(X，Y)的概率密度为[img=356x71]1803395b6527b0d.png[/img]设Z = X + Y的概率密度[img=40x25]1803395b6dc36d8.png[/img]，则[img=41x25]1803395b7554ba4.png[/img]=（ ）． A: 0 B: 1/8 C: 1/4 D: 3/4
- 设二维随机变量(X，Y)的概率密度为[img=356x71]1802f2b509f652e.png[/img]设Z = X + Y的概率密度[img=40x25]1802f2b5127d386.png[/img]，则[img=41x25]1802f2b51a7de69.png[/img]=（ ）． A: 0 B: 1/8 C: 1/4 D: 3/4
- 设二维随机变量(X，Y)的概率密度为[img=356x71]180390b006a79f6.png[/img]设Z = X + Y的概率密度[img=40x25]180390b00f17b02.png[/img]，则[img=41x25]180390b0176f356.png[/img]=（ ）． A: 0 B: 1/8 C: 1/4 D: 3/4