"one" or "one or more" ...
Which is more correct?
Alternatively, you could try the U.S.A for an examining framework that is often described as far more practical and relevant...until you take the FAA oral exam as part of a practical flight test and can't recall the minimum number of static wicks required for the aircraft to be used or the angle of dihedral of the horizontal stabiliser and then you realise that this sort of stuff is not only confined to EASA.