在一个倾斜层中,当测线沿界面倾向方向布设时,其反射波时距曲线方程是()。
A: t=1/v(x2+4h2-2xxm)yz
B: t=1/v(x2+4h2±4hxsinυx)yz
C: t=(x2+4h2+4hxsinυ)yz
A: t=1/v(x2+4h2-2xxm)yz
B: t=1/v(x2+4h2±4hxsinυx)yz
C: t=(x2+4h2+4hxsinυ)yz
举一反三
- 某平面简谐波在t = 1/4s时波形如图所示,则该波的波函数为:[img=231x102]1803d308279a21d.png[/img] A: y = 0.5cos(4πt-πx/2-π/2) (cm) B: y = 0.5cos(4πt + πx/2 + π/2) (cm) C: y = 0.5cos(4πt + πx/2-π/2)(cm) D: y = 0.5cos(4πt-πx/2 + π/2) (cm)
- 求不定积分[img=112x35]17da6538063a9e4.png[/img]; ( ) A: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/ B: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4))/8 C: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4)) D: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/8
- 一个沿x轴作简谐运动的振子,振幅为A,周期为T,其振动方程用余弦函数表达,当t=0时,振子过x=A/[img=25x26]18037477f04835e.png[/img]处向正方向运动,则振子的振动方程为[ ] A: x=Acos(2πt/T-π/3); B: x=Acos(2πt/T+3π/4); C: x=Acos(2πt/T-π/4); D: x=Acos(2πt/T-3π/4);
- 求函数[img=173x42]17da65390bf2806.png[/img]的导数; ( ) A: tan(pi/4 + x/2) B: (tan(pi/4 + x/2)^2/2 ) /tan(pi/4 ) C: (tan(pi/4 + x/2)^2/2 + 1/2) D: (tan(pi/4 + x/2)^2/2 + 1/2) /tan(pi/4 + x/2)
- 在MATLAB的Editor中输入下列语句:x=[13;24];y=norm(x(:,2));z=det(x);u=diag(x);v=polyval(u,1);运行后,在CommandWindow中对应y,z,u,v的输出结果为() A: 4 2 [1;2] 3 B: 4 -2 [1;4] 5 C: 5 2 [1;2] 3 D: 5 -2 [1;4] 5