[单选题]
The process during which a heavy nucleus such as udm2diy )fwx* n oq6ov;j g09h0ranium zmc7,v,g4-3q ve kqts;oef0s 1 d6npnsplits into two intermediate-sized nuclei after being strum; 0evv3-kc6,4 s1epzso f7n ng,td qqck by a neutron is referred to as
