钴-60的平均能量为()
A、0.31MEV
B、1.17MEV
C、1.25MEV
D、1.33MEV
E、4MEV
参考答案:C
民政经费包括()
A.民政事业费实际支出
B.民政事业基本建设投资
C.社会福利基金
D.公积金
E.社保基金
Helen has got___it takes to be a great tennis player.In other words, she has the potential to become world famous.
A.how
B.what
C.when
D.that