肝海绵状血管瘤的推荐放疗剂量为()
A.30~40Gy
B.15~20Gy
C.20~30Gy
D.40~45Gy
E.45~50Gy
参考答案:C
选择10以内的自然数组成一个比例是( )。
Look at the sign please._______ means that this way is for a disabled (残疾的) person to go through. [ ]