第20题: [单项选择]在诊断X线能量范围内,产生几率占5%的是 A. 相干散射 B. 光核反应 C. 光电效应 D. 电子对效应 E. 康普顿效应 参考答案:A 答案解析:相干散射在诊断X线能量范围内,产生几率占5%。
第21题: [单项选择]Questions 23 to 25 are based on the conversation you have just heard. A. They both live in New York. B. They both know Jack. C. They are both interested in music. D. They both enjoy camping. 参考答案:C 答案解析:[听力原文] What do Laura and Kate have in common 题目问Laura和Kate有何共同之处。前面已经说过她们是在一个音乐营认识的,而且这次她们要去林