joint vibrator
11TGV track construction — LGV construction is the process by which the land on which TGV trains are to run is prepared for their use, involving carving the trackbed and laying the track. It is similar to the building of standard railway lines, but there are differences.… …
12Vocal pedagogy — Vocal pedagogy, or voice pedagogy, is the study of the teaching of singing. Vocal pedagogists are people who study the teaching of singing. To some extent all voice teachers are vocal pedagogists because vocal pedagogy informs them about not only …
13Earth exploration — Introduction the investigation of the surface of the Earth and of its interior. By the beginning of the 20th century most of the Earth s surface had been explored, at least superficially, except for the Arctic and Antarctic regions. Today the… …
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