[填空题]
The energy produced by a fission reactor is about 2dr)d1 gfa(s- p00 MeV per fission. Whatpg pfh +l807 kf5n:;ef4ks-dw owiht. fract fl:fwpi sg8kk-no. 7;5 fwte+pdh40h ion of the rest mass of a $_{92}^{235}\text{U}$ nucleus is this? The ratio is about $\approx 1 : $