MCQOPTIONS
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| 1. |
In case of long tunnels, the drainage system consist of sump wells which are located at regular intervals of about. |
| A. | 50 m to 100 m |
| B. | 100 m to 200 m |
| C. | 200 m to 300 m |
| D. | 300 m to 500 m |
| Answer» E. | |