慢性放射性皮肤损伤的参考剂量阈值是
A.>5GyB.>10GyC.>15GyD.>20GyE.>25Gy
参考答案:C
解析:慢性放射性皮肤损伤的参考剂量阈值是>15Gy。
____ they are very tired, they feel happy because they’re finally finished
their project.
A.So
B.If
C.Although
D.But
地陪应在接站______前确认旅游团所乘交通工具的______时间。