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| Q. |
Which method can be adopted if full face excavation is not possible? |
| A. | back bearing method |
| B. | plotting |
| C. | trenching |
| D. | benching |
| Answer» D. benching | |
| Explanation: in case of no possibility of full face excavation, top heading method is adopted for having a better output. benching process is also adopted for digging small tunnels. | |
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