一、单项选择题(每小题的四个选项中,只有一项是正确的。每小题2分,共36分.) 1.原子弹和氢弹各是根据什么原理制造的? ( ) A.都是根据重核的裂变原理. B.都是根据轻核的聚变原理. C.原子弹是根据裂变原理,氢弹是根据聚变原理. D.原子弹是根据聚变原理,氢弹是根据裂变原理. First, single-choice questions (only one of the four options for each question is correct. 2 points for each question, for a total of 36 points.) 1. What are the principles of the atomic bomb and the hydrogen bomb? () A. Both are based on the principle of fission of heavy nuclei. B. All are based on the principle of fusion of light nuclei. C. Atomic bombs are based on the principle of fission. Hydrogen bombs are based on the principle of fusion. D. Atomic bombs are based on the principle of fusion, and hydrogen bombs are based on fission theory.