问题
选择题
与原子核内部变化有关的现象是( ) A.电离现象 B.光电效应现象 C.天然放射现象 D.α粒子散射现象 |
答案
答案:C
与原子核内部变化有关的现象是( ) A.电离现象 B.光电效应现象 C.天然放射现象 D.α粒子散射现象 |
答案:C
阅读对话,在方框中选择正确的句子填在下面的横线上。
Tony:Yes.I’m from China,and my hometown is Shanghai. Betty:Shanghai?(2)_________________ Tony:Yes,it is. Betty:(3)________________ Tony:About thirteen million people. Betty:(4)______________ Tony:No,it isn’t Beijing is smaller than Shanghai. Betty:(5)_______________ Tony:It’s very cold. Betty:Is it colder than Beijing? Tony:No,it isn’t.It’s warmer than Beijing. Betty:Oh,I like Beijing better. |