| 1. | Volume controllers are useful in public address systems 公共广播系统的音量控制器很有用。 |
| 2. | Public address system with zone control 公共广播系统包括区域控制 |
| 3. | I hear they ' re announcing my flight over the public address system 我听到扩音器在播我的班机信息了。 |
| 4. | I hear they are announcing my flight over the public address system 我听到扩音器在播我的班机信息了。 |
| 5. | Acoustic feedback is a common phenomenon in public addressing systems 声反馈,是扩声系统中的一种常见现象。 |
| 6. | Pas : public address system 公共广播音响系统 |
| 7. | Pas public address system 扩声系统 |
| 8. | Pas public address system 扩声系统 |
| 9. | Pc public address system 扩声系统 |
| 10. | Charge for the use of self - operated public address system not exceeding 2 hours 租用可由使用者自行操作的扩音设备收费不逾2小时 |