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