后颅窝CT扫描基线取（）
A.听眉线
B.听眦线（OML）
C.听眶线
D.听眶线10°
E.听眶线20°
参考答案：B
A flag is ____ a piece of cloth. It stands for a nation's people, their land and their history. [ ]
A. not more than
B. not less than
C. more than
D. no more than
判断颅底骨折，最有价值的临床表现是：（）
A.严重头痛
B.鼻孔流血
C.球结膜下出血
D.脑脊液漏，熊猫眼征
E.恶心呕吐
