What river is important as the transportation routes in source of hydroelectric power in russia and is the longest river in europe?

Volga River is the longest river in Europe.
It is also a source of hydroelectricity for many Russian cities along its basin

The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion

True the answer is true