第13题: [单项选择]直肠下1/3锐器贯通伤的处理原则为()。 A. 清创缝合创口,直肠周围间隙引流 B. 尽早清创,一期缝合创口 C. 清创延期缝合创口,直肠周围间隙引流 D. 乙状结肠襻式造口,冲洗远端肠腔,修补损伤 E. 乙状结肠单腔造口,冲洗远端肠腔关闭,修补损伤,直肠周围间隙引流 参考答案:E
A. a computer model B. studies which show ice melted equally in the North and the South during the ice age C. most of the ice melted in the Northern hemisphere (半球) during the 30,000 year long ice age D. a survey result 参考答案:B 答案解析:[解析] 根据主题句ice melted equally in the North and the South可知,本文主要讲述一个新的科学发现:冰川时期的冰川融化是在南北极均匀进行的。