- Ceimic Chemistry
#3756
- helium s
- en
...i gcás héiliam nó gáis eile a bheith á n-úsáid a chuireann isteach go suntasach ar tharchur fuaime, dímheascóir gutha oiriúnach...
...if breathing mixtures containing helium or other gases which significantly distort sound transmission are being used, a suitable voice unscrambler, and...