单项选择题
A.15mg/100ml B.20mg/100ml C.30mg/100ml D.10mg/100ml E.40mg/100ml
A.脑脊液可经鼻咽部漏入鼻咽 B.脑脊液可经中耳经咽鼓管至鼻腔 C.脑脊液可经额窦进入鼻腔 D.脑脊液可经筛窦进入鼻腔 E.脑脊液可经上颌窦进入鼻腔