为满足通信质量、不失真、电台的发射占用带宽应大于或等于必要带宽。
参考答案：对
Several students of our school won a(n) ________ victory in the English Drama Contest with
their excellent performing talents. [ ]
A. inescapable
B. dispensable
C. unalterable
D. indisputable
A．，正电荷
B．，正电荷
C．，负电荷
D．，负电荷
，正电荷
，正电荷
，负电荷
，负电荷