题目

—Julie, are you going to Mike's birthday party on Sunday? —________ I am invited A . Unless B . Since C . Though D . While 答案：A04广西23 ．中子n、质子p、氘核D的质量分别为现用光子能量为E的γ射线照射静止氘核使之分解，反应的方程为                                                         若分解后中子、质子的动能可视为相等，则中子的动能是    A                B．       C．             D．