|
|
| 91. | excavation plan |
| 挖掘工程计划 |
|
|
| | |
| 92. | quarried products |
| 冰川挖掘产物 |
|
|
| | |
| 93. | optimum depth of cut |
| 最佳挖掘深度 |
|
|
| | |
| 94. | grab type dredge |
| 抓斗挖掘船 |
|
|
| | |
| 95. | spiral cutter-head |
| 螺旋形挖掘头 |
|
|
| | |
| 96. | potato raising plough |
| 马铃薯挖掘犁 |
|
|
| | |
| 97. | tunnel boring works |
| 隧道挖掘工程 |
|
|
| | |
| 98. | visit the excavations |
| 参观挖掘现场. |
|
|
| | |
| 99. | excavating and loading teeth |
| 挖掘装载齿 |
|
|
| | |
| 100. | excavation without timbering |
| 无支撑挖掘 |
|
|
| | |