未知题型 相互独立的均匀分布求和一定是均匀分布

未知题型 每日停用或减量镇静剂一次，评估是否可以撤机或拔管，应尽早拔除气管插管（）

单项选择题 根据以下材料，回答题In a telephone survey of more than 2,000adults,21% said they believed the sun revolved （旋转） around the earth. An 51 7% did not know which revolvedaround 52. I have no doubt that 53 all of th