There is a great deal of evidence _______ that music activities engage different parts of the brain.

A．indicate

B．indicating

C．to indicate

D．to be indicating

关于照射野的X线量分布，叙述错误的是

A．近阴极端量多
B．近阳极端量少
C．沿球管短轴方向对称
D．关于球管长轴对称
E．近阴极端有效焦点小