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问题 单项选择题

下列关于胰腺癌的CT表现，错误的是（）

A.平扫时胰腺肿块为低密度

B.可伴有肝内外胆管和胰管的扩张

C.增强扫描动脉期，病变由低密度肿块变为高密度肿块

D.可以侵犯胰周血管

E.可伴有后腹膜淋巴结转移

答案

参考答案：C

选择题

用四舍五入法，按保留三个有效数字的要求，求得0.02026的近似值是（　　）

A．0.020

B．0.0203

C．0.021

D．0.0202
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改错题

短文改错（每小题1.5分，共15分）

下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。

增加：在缺词处加一个漏字符号(∧)，并在其下面写上该加的词。

删除：把多余的词用斜线(\)划掉。

修改：在错的词下划一横线，并在该词下面写上修改后的词。

注意：1.每处错误及其修改均仅限一词；

2．只允许修改10处，多者(从第11处起)不计分。

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