A：I can’t seem to find a color TV of the n
题型：单项选择题
问题：
A：I can’t seem to find a color TV of the new model.
B: ().
A. Why don’t you try the new store on King’s Road
B. There’s also something wrong with my TV set.
C. Don’t you know the new model you want is not on the market yet
D. The new model is far more expensive than those old ones.
具有放射性，能自发衰变放出某种粒子，其核反应方程为
，请完成下列填空：
粒子中含有_________个中子；1919年英国物理学家卢瑟福用该粒子轰击氮核
，发现了___________，其核反应方程为____________________。