string(3) "DDD"
NULL
string(3) "AAA"
string(3) "CCC"
string(4) "user"
NULL
NULL
string(3) "CCC"
string(4) "user"
NULL
E 1 مقاله: توربین های آبی Improvement of the efficiency of the Agnew micro hydro turbine at part loads due to installing guide vanes mechanism
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