题目: 光电效应中,从同一金属逸出的电子动能的最大值[ ]A.只跟入射光的频率有关 B.只跟入射光的强度有关C.跟入射光的频率和强度都有关 D.除跟入射光的频率和强度有关外,还和光照时间有关 答案: 答案:A
题型:选择题 Many kinds of books, newspapers and magazines _____ in this library.[ ]A. are kept B. is being keptC. are keeping D. have kept 查看答案