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问题 单项选择题

下列设备中，既可做输入设备又可做输出设备的是

A．图形扫描仪

B．磁盘驱动器

C．绘图仪

D．显示器

答案

参考答案：B

解析： 磁盘驱动器既可用来读取磁盘信息，亦可向磁盘写入。

单项选择题 A3/A4型题

女性，38岁，反复发作吞咽困难10余年，钡剂造影发现食管下端呈鸟嘴样狭窄，食管体部增宽达5cm。

首要诊断是（）。

A.食管癌

B.贲门失弛缓症

C.食管化学烧伤

D.食管炎

E.先天性巨食管
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单项选择题

Many students agreed to come, but some students against because they said they don’t have time.

A. did not because they say they did not
B. were against because they say they don’t
C. did not because they said they did not
D. were against coming because they said they don’t
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