| 1. | Pral - 2 - bs pre - amp alum chassis case 2 unit size 前级铝机箱2 unit size |
| 2. | B . forward analog signals regulate circuit 2前级模拟信号调理电路。 |
| 3. | Pral - 1 - bs pre - amp alum chassis case 1 unit size 前级铝机箱1 unit size |
| 4. | Pral - 2 - bg pre - amp alum chassis case 2 unit size 前级铝机箱2 unit size |
| 5. | Pral - 2 pre - amp alum chassis case 2 units size 前级铝机箱2 units size |
| 6. | Pral - 1 pre - amp alum chassis case 1 unit size 前级铝机箱1 unit size |
| 7. | B . front stage analog signal processing circuit . c 2前级模拟信号放大与调理电路的介绍。 |
| 8. | Backing space technique 前级真空技术 |
| 9. | Explosive , corrosive to ferrous metal , chemical reactive with vacuum pump oil 本型泵可以单独使用,也可作为其他高真空泵的前级泵。 |
| 10. | Backing side trap 前级侧阱 |