根据量纲齐次原则,下列物理关系中,成立的是
A: [img=87x53]1803b4f4cae92e3.jpg[/img]
B: [img=72x53]1803b4f4d2aba9f.jpg[/img]
C: [img=71x25]1803b4f4da3077b.jpg[/img]
D: [img=68x49]1803b4f4e309913.jpg[/img]
A: [img=87x53]1803b4f4cae92e3.jpg[/img]
B: [img=72x53]1803b4f4d2aba9f.jpg[/img]
C: [img=71x25]1803b4f4da3077b.jpg[/img]
D: [img=68x49]1803b4f4e309913.jpg[/img]
举一反三
- 设[img=127x53]17f1b3d6db98b83.jpg[/img],f(x)=arctanΧ,则[img=56x55]17f1b3d82842941.jpg[/img]=()。 A: π B: 3π/4 C: -3π/4 D: 2π
- 设随机变量X的概率密度为[img=172x58]1802fe3273041d3.png[/img]则使得F{X > a} = F{X < a}成立,则a为( ). A: 2-1/4 B: 21/4 C: 1/2 D: 1-2-1/4
- 已知y=f(x)是奇函数,当x≥0时,[img=62x34]17e0bf81aac3b63.png[/img],则f(-8)的值是( ) A: -8 B: -4 C: 4 D: 8
- 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
- 已知三次函数f(x)=(1/3)[img=18x22]1802e2b148262dd.png[/img]-(4m-1)[img=18x22]1802e2b1512ca3b.png[/img]+(15[img=23x22]1802e2b159732bb.png[/img]-2m-7)x+2在x∈(-∞,+∞)是增函数,则m的取值范围是(). A: m<2或m>4 B: -4<m<-2 C: 2<m<4 D: m>4