The apothecary system is a system of weights used by doctors and pharmacists for medical reasons.
http://en.wikipedia.org/wiki/Apothecaries\'_system
What are the key components of the apothecary system?
one grain in the apothecary system is equal to 64.8 mg. however, it is rounded off to 60mg or 65mg
embedded system
The excretory system.
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