[填空题]
Some electric-power comp15bd*ak f5pbc br,-rwx kj8 9xanies use water to store energy. Water ipz 7gt5hbvluw:3m k(7s pumped by reversible turbine pumps from a low to :tw 5g7vplu hb(7k3mz a high reservoir. To store the energy produced in 1.0 hour by a 120-MW ($120\times10^{6}$W) electric-power plant, how many cubic meters of water will have to be pumped from the lower to the upper reservoir? Assume the upper reservoir is 520 m above the lower and we can neglect the small change in depths within each. Water has a mass of 1000 kg for every 1$m^3$. $m^3$
