对厚度差较大的工件,散射比随射线能量的增大而增大。
参考答案:错
They say “____”, but there is every chance that Usian Bolt will strike again later this week, when he will try to break the 200 meters world record he set in Beijing.
A.A little knowledge is a dangerous thing
B.Lightning never strikes twice in the same place
C.Where there is a will, there is a way
D.Failure is the mother of success
男性,47岁,头痛发病,病程4个月,入院前出现左侧肢体无力和呕吐。入院检查,意识清,眼底视 * * 水肿,左上下肢肌力Ⅳ级,腱反射活跃,病理征(+)。
根本治疗原则是()
A.脱水治疗
B.给予抗炎治疗
C.冬眠物理降温
D.去病因治疗
E.去骨瓣减压