| 1. | Quantities used in alternating current theory ; two - line circuits 交流电理论数值.双线电路 |
| 2. | Quantities used in alternating current theory - part 2 : multi - line circuits 交流电理论数值.第2部分:多线电路 |
| 3. | Digital subscriber line circuit dslc 数字用户线电路 |
| 4. | Analog line circuit alc 模拟用户线电路 |
| 5. | Unbalanced wire circuit 不平衡线电路 |
| 6. | Common return circuit 公共归线电路 |
| 7. | Balanced wire circuit 平衡线电路 |
| 8. | Parity - line circuit 配类线电路 |
| 9. | Two wire circuit 双线电路 |
| 10. | Two - wire circuit 双线电路 |