|
41. | optimum depth of cut |
| 最佳挖掘深度 |
|
|
| |
42. | sea-going dredge |
| 海洋挖掘船 |
|
|
| |
43. | dredge stripping |
| 挖掘船剥离 |
|
|
| |
44. | tunnel boring works |
| 隧道挖掘工程 |
|
|
| |
45. | depth of vertically digging |
| 垂直挖掘深度 |
|
|
| |
46. | quarried products |
| 冰川挖掘产物 |
|
|
| |
47. | dig with a pick |
| 用镐挖掘 |
|
|
| |
48. | spiral cutter-head |
| 螺旋形挖掘头 |
|
|
| |
49. | optimum height of cut |
| 最佳挖掘高度 |
|
|
| |
50. | excavating and loading teeth |
| 挖掘装载齿 |
|
|
| |