Watch the video and put the following facts in the order of appearance in the track:
3.
| A broken rock falls into a bucket wheel. | |
| The automotive device presses the rock. | |
| Vertical and horizontal position of a cutting head is constantly controlled. | |
| While boring goes on, work on construction of a protective roof is carried on. | |
| A complete ring of arch segments is transported to its final position. | |
| The cutting head rotates under a pressure of 27 tons. | |
| This TBM was specially developed for the hard rock. | |
| A broken rock is transferred onto a conveyer belt behind the cutting head. | |
| Steel arch segments are put under the protective roof. | |
| Each cutter chips the rock away. |
Watch the track again and answer the following questions:
4. How many cutters does the cutting head have?
5. What distance can TBM drive a day?
6. What is TBM compared to?
7. How long is the TBM shown in the track?
8. What is the length of the TBM compared to?