Answer:
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Just read the directions and follow them. this isn’t hard
It means that there are 3 beats per measure and one quarter note equals one beat.
I believe the correct answer is: material that the lens is
made from.
Lenses are engineered to have
specific focal lengths, besides the curvature of the two sides of a lens. The
focal range, the distance between your optic nerve and the retins in lens, of
the lenses is determined by the material that lenses are made from.
