In which situation could a vessel most easily capsize?（）

A.Running into head seas

B.Running in the trough

C.Running with following seas

D.Anchored with your bow into the seas

总剂量与总治疗时间的比值定义的是（）

A.照射时间

B.总治疗时间

C.瞬时剂量率

D.治疗平均剂量率

E.参考剂量率