根据( )划分,证券市场可分为证券发行市场和证券交易市场。
A.市场的效率
B.市场的作用
C.市场的功能
D.交易标的物
参考答案:C
— Why was it so noisy over there?
— Mo Yan, the Nobel Literature Prize Winner, was surrounded by journalists ____ he made public appearance at today’s press conference.
A.until
B.so that
C.in case
D.the instant
用加速后动能为Ek0的质子轰击静止的原子核x ,生成两个动能均为Ek的核,并释放出一个频率为v的γ光子。写出上述核反应方程并计算核反应中的质量亏损。(光在真空中传播速度为c)