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问题 单项选择题 A1/A2型题

急性硬膜外血肿的CT表现，下列错误的是（）。

A.颅骨内板下双凸形高密度区，边界锐利

B.血肿范围较大，经常跨越颅缝

C.血肿密度均匀，也可因为混有血清、脑脊液或气体而呈混杂密度

D.可见占位效应，中线结构移位，侧脑室变形、移位

E.血肿可伴有局部颅骨骨折

答案

参考答案：B

解析：由于颅骨与硬脑膜之间结合紧密，尤其颅缝处，所以硬膜外血肿范围一般不跨越颅缝。如骨折超越颅缝，血肿也可跨越颅缝，形态为梭形或双凸形的高密度影。

单项选择题

设z=ln(x2+y)，则等于()．

A.A

B.B

C.C

D.D
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单项选择题

M: Excuse me, do you have change for a ten-dollar note I need to pay the parking motor.
W: I’m sorry, but I think you can get it through the money changer in the shopping center across the street.
Q: What is the man trying to do().

A. Get some small change.

B. Find a shopping center.

C. Cash a check at a bank.

D. Find a parking meter.
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