简介:Cerebral Aneurysm statistics in United States The true incidence of intracranial aneurysms is unknown but is estimated at 1-6% of the population (Wiebers,and another series found aneurysms in 1% of patients undergoing 4-vessel cerebral angiography for indications other than subarachnoid hemorrhage (SAH). Familial intracranial aneurysms have been reported (Schievink,1997). Whether this represents a true increased incidence is unclear. Aneurysms typically become symptomatic in people aged 40-60 years
简介:摘要在小学语文教材中有些文章是有相似之处的,在教学中教师可根据教材情况进行案例整合,选取两篇在结构或是写法上有相同之处的文章进行对比讲授,让学生掌握学习方法,提高学习能力。