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问题 单项选择题

电路交换系统有（）和时分交换两种方式。

A．分组交换

B．报文交换

C．空分交换

D．帧中继交换

答案

参考答案：C

解析：

电路交换系统有空分交换和时分交换两种交换方式。故答案为C选项。

单项选择题 共用题干题

患者，男性，56岁。右肘关节疼痛3个月来诊；查体：右前臂近肘关节外侧压痛，右肘关节活动自如，局部未见明显红肿及静脉怒张。

下列检查方法首选（）

A.MRI平扫

B.血管造影

C.CT平扫

D.超声

E.体层摄影
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填空题

用所给动词的适当形式填空。

1  He _____ (wash) the dishes in the kitchen when I saw him yesterday evening.

2. Some old people are happy _____ (be) with the young ones.

3. Tom says he _____ (not watch) the video film tonight.

4. How _____ Bob _____  (go) to school every day except weekends?

5. "Mun, I saw a new kind of bike. It _____ (cost) only two hundred and fifty yuan,"  "Oh, really?"

6. Can she _____ (run) as fast as Helen ?

7. We_____ (visit) the Great Wall next week.

8. Don't _____ (talk) now.

9. Let's_____ (try) our best _____ (finish) the work in an hour.
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