新生儿坏死性小肠结肠炎腹部X线片最具特征性的表现是
A．腹腔游离气体
B．肠壁积气
C．结肠充气
D．肠腔液平段
E．肠间隙模糊
参考答案：B
选择正确的单词填空。
1. Li Ying is __________ a picture. (draw, drawing)
2. The children are __________. They are laughing __________. (loudly, loud)
3. __________! I __________ my nose. (hurt, Help)
4. The film __________ in a camera! (go, goes)
5. __________ is tired and hungry. (We, Everyone)
6. We go to Beijing __________ train. (in, by)
在病人死后，用于分离病毒的尸体标本的采集时限是（）
A.6小时内
B.8小时内
C.12小时内
D.24小时内
E.3天内
