[填空题]
A nuclear power plant operates a 8p 2-b)ub-ad e2w nnmns3 (:roivveg2t b) 66o(iu*r znlhsr *o75% of its maximum theoretical (Carnot) efficiency between tempeozr66l*so b iun*) r(hratures of 625$^{\circ}\,C$ and 350$^{\circ}\,C$. If the plant produces electric energy at the rate of 1.3 GW, how much exhaust heat is discharged per hour? $ \times10^{13 }J/h$
