Assertion: diver | /r/HasProperty | competent
Facets:
value: to use them
type: PURPOSE
value: at equalising the ears
type: OTHER
value: in these cases
type: OTHER
value: in their use
type: TEMPORAL
Source sentences:
text: For some diving, gas mixtures other than normal atmospheric air (21% oxygen, 78% nitrogen, 1% trace gases) can be used, so long as the diver is competent in their use.
text: To avoid injury during descent, divers must be competent at equalising the ears, sinuses and mask; they must also learn not to hold their breath while ascending, to avoid barotrauma of the lungs.
text: In these cases the divers should be competent in procedures for diving with a guideline.
text: Divers must be competent in change-over procedures, including shutdown of the free-flowing equipment.
text: If lifelines are used, both divers and tenders must be competent to use them.