下列“绞窄性肠梗阻”平片征象,错误的是()
A.空回肠换位征
B.假肿瘤征
C.小跨度蜷曲肠襻
D.咖啡豆征
E.警戒肠管征
参考答案:E
Heating the news that my father was ill,I was so worried that I couldn’t on anything.
A.count
B.consider
C.contain
D.concentrate
任何一个基于"比较"的内部排序的算法中,若对6个元素进行排序,在最坏情况下所需的比较次数至少为()
A.10
B.11
C.21
D.36