下列哪些与小脑幕裂孔疝无关（）
A.头痛、呕吐
B.两侧瞳孔不等大，意识清楚
C.昏迷、偏瘫
D.双下肢截瘫
E.意识障碍
参考答案：B, D
Travelling by air is ____ more expensive than by train even though the air tickets are on discount
（打折）. [ ]
A. very
B. a lot of
C. many
D. far
M24粗牙螺纹的螺距是（）毫米。
A、1
B、2
C、3
D、4
