一、选择题1.近几年,我国北京、上海等地利用引进的γ刀成功地为 5000余名脑肿瘤患者做了手术。令人称奇的是,由于γ刀利用的是γ射线的特性,所以手术时不必麻醉,病人清醒,半小时内即可完成手术 ,无需住院,因而γ刀被誉为“神刀”。据报道,我国研制的旋式γ刀性能更好,即将 First, multiple-choice questions 1. In recent years, China’s Beijing, Shanghai and other places have successfully performed operations on more than 5,000 brain tumor patients with the introduction of gamma knife. Surprisingly, because the gamma knife uses gamma rays, it does not require anesthesia during surgery. The patient is awake and can complete the surgery within half an hour without hospitalization. Therefore, the gamma knife is known as the “Sword”. According to reports, the rotary gamma knife developed in China has better performance.