第23题: [单项选择]腹股沟直疝和斜疝的共同点是 A. 都不易嵌顿 B. 都应手术治疗 C. 疝环都位于腹壁下动脉的内侧 D. 疝囊均通过腹股沟管 参考答案:B 答案解析:[考点] 腹股沟斜疝与直疝的鉴别诊断
[分析] 腹股沟斜疝自腹股沟管内口(腹壁下动脉外侧)突出,通过腹股沟管自腹股沟管外环突入阴囊,因此外环口扩大,因腹股沟管内口小,又经过腹股沟管这一狭窄通道,故易
A. meet the needs created by unexpected crisis such as hurricanes B. give food to those nations that need it C. find a way of helping poorer nations to cope with emergencies D. help the poorer nations to help themselves 参考答案:D 答案解析:[试题详解]文章最后四个自然段讲述WPF如何工作及它所取得的成就,根据文章倒数第二个自然段最后一句话,The real objective is to aid constructive develop