搜题请搜索小程序“爱下问搜题”
问题 单项选择题 共用题干题

7岁男孩，平时反复发生呼吸道感染，每年发生肺炎2～3次，活动后乏力、气促、无发绀。胸骨左缘第3～4肋间有Ⅲ～Ⅳ级收缩期杂音，粗糙，传导广，伴震颤。临床怀疑先天性心脏病：室间隔缺损。

此患儿入院后为了明确诊断，主要依靠下列哪项检查（）

A.心电图

B.心三位胸片

C.右心导管检查

D.放射性核素检查

E.多普勒彩色超声心动图

答案

参考答案：E

填空题

用树型结构表示实体类型及实体间联系的数据模型称为【 】；用二维表格表示实体类型及实体间联系的数据模型称为【 】。
查看答案
单项选择题

Police statistics have shown that automobile antitheft devices reduce the risk of car theft, but a statistical study of automobile theft by the automobile insurance industry claims that cars equipped with antitheft devices are, paradoxically, more likely to be stolen than cars that are not so equipped:
Which one of the following, if true, does the most to resolve the apparent paradox ？（）

A．Owners of stolen cars almost invariably report the theft immediately to the police but tend to delay notifying their insurance company, in the hope that the vehicle will be recovered.

B．Most cars that are stolen are not equipped with antitheft devices, and most cars that are equipped with antitheft devices are not stolen.

C．The most common automobile antitheft devices are audible alarms, which typically produce ten false alarms for every actual attempted theft.

D．Automobile owners who have particularly theft-prone cars and live in areas of greatest incidence of car theft are those who are most likely to have antitheft devices installed.

E．Most automobile thefts are the work of professional thieves against whose efforts antitheft devices offer scant protection.
查看答案