脊髓损伤水平定位在L4平面关键肌为()。
A.伸膝肌(股四头肌)
B.屈髋肌(髂腰肌)
C.踝背伸肌(胫骨前肌)
D.长伸趾肌(趾长伸肌)
E.踝跖屈肌(腓肠肌、比目鱼肌)
参考答案:C
The problem of the present world is that those who are imaginative have little experience
those who are experienced have weak imagination.
A.unless
B.although
C.because
D.while
缺铁性贫血最常见的病因是
A.慢性失血
B.铁吸收不良
C.铁摄入不足
D.铁失利用
E.免疫功能障碍