问题
填空题
根据句意和首字母提示完成下列句子。
l. Have a glass of orange j_____, please．
2. I often have a bowl of p_____ for breakfast.
3. D_____ are traditional(传统的) food on Spring Festival in China.
4. The s_____ is very delicious. Would you like it?
5. His mother likes to drink green t_____ in the afternoon.
答案
1. juice
2. porridge
3. Dumplings
4. soup
5. tea
，镭核沿着+x方向释放一个α粒子后衰变成氡核(Rn)，在Y轴上放有粒子接收器，移动粒子接收器，在N点能接收到α粒子，N点到O点的距离为l，已知OA间距离为
，α粒子质量为m、电荷量为q，氡核的质量为M。