8岁男孩，疝内容物可达阴囊处。诊断应考虑()
A. 腹股沟斜疝
B. 腹股沟直疝
C. 股疝
D. 脐疝
E. 切口疝
创面有大量坏死组织和脓液时，换药宜选用的外用药是()
A. 优琐
B. 0．1％雷佛奴尔
C. 0．02％呋喃西林
D. 0．9％氯化钠
E. 0．1％新洁尔灭
How should we understand the social benefits of a sustainable transportation system？
A. It should be efficient.
B. It should be safe.
C. It should be friendly.
D. It should be constructive.
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