()是慢性胆囊炎患者的一个非敏感的,但却非常特异性的征象。
参考答案:肠道先于胆囊出现放射性
计算:sin30°+3cos245°-tan60°•cot60°
Summarize the story of Mark Twain’s Adventures of Huckleberry Finn in about 100 words, and comment on the theme of the novel.