题型:问答题 简答题 —You had better _____ food to the tigers. —Sorry, I _____ do it again.[ ]A. throw; will, B. don't throw; won't C. not throw; won't D. not to throw; will 查看答案
题型:问答题 简答题 不定项选择下列说法中正确的是( )A.β衰变现象说明电子是原子核的组成部分 B.目前已建成的核电站的能量来自于重核裂变 C.一群氢原子从n=3的激发态跃迁到基态时,能辐射3种不同频率的光子 D.卢瑟福依据极少数α粒子发生大角度散射提出了原子核式结构模型 查看答案