问题
不定项选择
下列说法正确的是[ ]
A．α粒子大角度散射表明α粒子很难进入原子内部
B．核反应方程
属于裂变
C．β衰变中产生的β射线是原子核外电子挣脱原子核束缚后形成的
D．放射性元素的半衰期不随温度的变化而变化
答案
答案：D
搜题请搜索小程序“爱下问搜题”
下列说法正确的是[ ]
A．α粒子大角度散射表明α粒子很难进入原子内部
B．核反应方程属于裂变
C．β衰变中产生的β射线是原子核外电子挣脱原子核束缚后形成的
D．放射性元素的半衰期不随温度的变化而变化
答案：D
This year I go to a new middle school. I love very much. It’s very big and clean. We have buildings — one is for studying, and the other one is for living. We have three . We do experiments(实验) there. I like doing experiments. I think it’s very . There are 50 computers in the computer room, we all love Computer class. There are flowers, grass and trees on the playground. We often sit there and draw pictures of them in class. In this school, teachers and students are like friends. I enjoy here. I like all the subjects and teachers. How your school life? Do you like it, too? Please write and me.
|