The strength of the acid solution is chosen to rapidly dissolve the oxides or the oxygen containing compounds, and {HEAD ~ the choice} is within {TAIL ~ the skill} of a person skilled in the art 
The strength of the acid solution is chosen to rapidly dissolve the oxides or the oxygen containing compounds , and { HEAD ~ the choice } is within { TAIL ~ the skill } of a person skilled in the art
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH