[单选题]
瑞典γ刀和沃发OUR,γ刀各使用了多少个源,其源的活度()
A.201,30,5000Ci
B.30,201,6000Ci
C.201,30,6000Ci
D.201,201,6000Ci
E.30,30,5000Ci
参考答案与解析: