电器设备着火时,首先应该切断电源,在切断电源前,只准用()进行灭火。A.铁板 B.水

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问题:

电器设备着火时,首先应该切断电源,在切断电源前,只准用()进行灭火。

A.铁板

B.水

C.不导电的灭火器材

考点:矿井机电维修工矿井机电维修工题库
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棉花地膜覆盖能增温保温,使土壤水分相对稳定。

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补全对话。    

根据对话内容,在空格中各填写一个句子或单词,使对话完整,正确,达意。    

A:Where are you going for vacation?

B:1.____________

A:Hainan Island? It’s very 2.___________there.

B:But I don’t mind the hot weather because

      I like swimming and surfing.

A:Sounds great. 3.____________

B:For about two weeks-from June 28th to

      July 11th. How about you?

       Where are you going?

A:I’d like to go to Shanghai.

B:4.___________

A:Because, you know, the World Expo(世博会)

       is going on in Shanghai.

B:5.___________ It’s a good chance to learn

       about foreign countries.

A:And it’s also a good chance to know about

       our future life.

B:That’s true.

题型:单项选择题

产生于耳蜗,经听骨链和鼓膜传导释放到外耳道的音频能量称为()

A.声导纳

B.声阻抗

C.声导抗

D.耳声发射

E.以上均不对

题型:单项选择题

某 Web 网站向CA 申请了数字证书。用户登录该网站时,通过验证(61) ,可确认该数字证书的有效性,从而(62) 。

62()

A.向网站确认自己的身份

B.获取访问网站的权限

C.和网站进行双向认证

D.验证该网站的真伪

题型:单项选择题

对稿件的处理一般包括()等。

A、合格稿件及时编发

B、时效强的新闻抢发

C、有缺点的稿件加以修改

D、需作重大改动的稿件交原作者改写

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