| 1. | In 1728 euler gave differential equations for geodesics on surfaces .
1728年，奥伊勒绘出了曲面上测地线的微方程。 |
| 2. | The theory of surfaces made a slow start. it began with the subject of geodesics on surfaces .
曲面理论也经历了一个漫长的开端，曲面理论是从曲面上的测地线的研究开始的。 |
| 3. | Run all ground wires to a common ground point
把所有地线连到一公共的接地点。 |
| 4. | Be sure to connect the black ground lead to it first
务必首先连接黑色地线。 |
| 5. | Directional ground relay set for 6 . 6 kv consumer
6 . 6 kv用电设备用地线定向继电装置 |
| 6. | Grounding wire : adopt semiconducting rubber wrap
地线：采用半导电橡皮包覆。 |
| 7. | Formed wire dead - end for opgw double layer
光纤复合地线opgw用双悬垂线夹 |
| 8. | For these reasons ground loops are best avoided
这时要努力消除地线回路。 |
| 9. | Ground wire : conductor outside wraped semiconductive rubber
地线：导体包覆半导电橡皮。 |
| 10. | Trace the ground wire . it should lead you to the coil
跟着地线走，他会让你发现那条线路的 |
