扫描式频谱分析仪在()的条件下得到最好的灵敏度。 A.最窄的分辨带宽 B.降低扫描带

题型:多项选择题

问题:

扫描式频谱分析仪在()的条件下得到最好的灵敏度。

A.最窄的分辨带宽

B.降低扫描带宽

C.最小的输入衰减

D.适当利用视频滤波器

考点:无线电监测技术无线电监测技术题库
题型:多项选择题

电梯的引导系统由( )组成。

A.门锁装置

B.缓冲器

C.导轨

D.导轨架

题型:多项选择题

已知成绩关系如下表所示:


执行SQL语句:
SELECT DISTINCT 学号
FROM 成绩
WHERE 分数>60
查询结果中包含的元组数目是 (24)

题型:多项选择题

单词拼写: 根据下列句子及所给的首字母写出空缺处各单词的正确形式。

1. People began to concentrate less on religious themes and a___ a more humanistic attitude to life.

2. Jack likes modern Chinese paintings while Alice has a p_____ for pre-twentieth century

    Western paintings.

3. Some poems tell a story and some c__________ certain emotions.

4. He began to smoke several years ago, and then soon became a____ to cigarettes. Now he is a

    heavy smoker.

5.If you develop AIDS, your chances of s__________ are very small.

6.Obviously they disagree with us. In other words, they are o__________ to our point of view.

7.Ladies and gentlemen, first I want to thank you for your help on b__________ of my school.

8.We congratulated him on his being a__________ as the chief engineer of the company.

9.The village lies in a valley and is s__________ by mountains.

10.As is often the case, c__________ often drives people to explore the unknown world.

题型:多项选择题

RCS-985保护中发电机纵差保护主要功能?

题型:多项选择题

客户办理短信签约业务时,核心系统按账户补签约中显示未上行确认状态是指()

A.客户未回复确认短信,短信信使未签约成功

B.客户已确认,短信签约成功

C.客户未收到短信

D.客户没有回复短信,短信签约成功

更多题库