411H—→42He+20n+1e+2.67×10^7eV 　21H+21H—→32He+10n+3.2×10^6eV 　21H+21H—→31He+11H+4×10^6eV 　　31H+21H—→42He+10n+1.76×10^7eV 　　后三个反应的净反应是 　　521H—→42He+32He+11H+210n+2.48×10...