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| Q. |
An is an oldest type of machine which removes earth. |
| A. | escalator |
| B. | excavator |
| C. | elevator |
| D. | bulldozer |
| Answer» B. excavator | |
| Explanation: excavator performs it work of moving the earth while the main unit is stationary. the title effort is required to move the dead weight of earth in a vertical plane. | |
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