皮内注射时()。
A.针头与皮肤呈5°
B.针头与皮肤呈20°~25°
C.针头与皮肤呈直角
D.针头与皮肤呈60°
E.针头与皮肤呈30°~40°
参考答案:A
The old man came _____ to the railway station, only _____ the train was slowly pulling out of the station. [ ]
A. and ran; found
B. running; finding
C. running; to find
D. to run; finding
2岁女孩。因发热,咳嗽3天,1天来诉右耳痛,五官科诊断为急性卡他性中耳炎。其发病机制为()
A.小儿喉部呈漏斗型,感染不容易向下,故向周围蔓延
B.血行播散
C.淋巴管播散
D.咽鼓管较宽、直而短、呈水平位
E.上呼吸道IgA分泌