第7题: [多项选择]患儿男,2月龄,因“气促1周,加重伴咳嗽1d”来诊。体温最高38℃,气促,口周发绀,予吸氧、头孢曲松治疗,无好转。足月顺产,新生儿期体健。查体:T38.5℃,P160次/min,R60次/min。口周发绀,右侧胸廓稍隆起,叩鼓音,呼吸音降低,有哮鸣音及啰音。为明确诊断首先应检查的项目包括() A. 血常规 B. PPD试验 C. 心脏彩色超声 D. 胸部X线片 E. 胸腔穿刺检查 F. 胸部B型超声 G. 血气分析 参考答案:A, D
第15题: [填空题]冒泡排序在最坏情况下的比较次数是______。 A) n(n+1)/2 B) nlog2n C) n(n-1)/2 D) n/2 参考答案:C 答案解析:[解析] 如果线性表的长度为n,则在最坏情况下,冒泡排序需要经过n/2遍的从前往后扫描和n/2遍的从后往前扫描,需要比较次数为n(n-1)/2。
第18题: [单项选择]Next semester, Susan must take three compulsory courses. A. formal B. voluntary C. practical D. required 参考答案:D 答案解析:[解析] compulsory必须的,强制性的。formal正式的;voluntary自愿的,义务的;practical实际的,实践的;required必需的。故答案为D。
第21题: [单项选择]A. She should be extremely careful with the experiment. B. She should set up the experiment right now. C. She should think carefully before setting up the experiment. D. She should make sure the experiment is finished on time. 参考答案:A 答案解析:[听力原文] W: Professor Lincoln, I think I got this experiment set up right now. M: You only think