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【单选题】
听力原文：W: Good morning, this is Miss Smith's secretary. M: Good morning, may I speak to Miss Smith, please? W: I'm sorry. She's in conference at the moment. Do you want to leave a message? M: Yes, all right. Can you tell her that Mr. Johnson called? And tell her that the meeting about the Trade Fair is on Thursday 12th at 2 p.m. W: Fine, is there anything else? M: Yes. Could she phone to confirm that she can come before tomorrow? W: Yes, and what number is it? M: 566—7896 Extension 332. W: Fine, I've got that. I'll get the message to her as soon as possible. M: Thank you very much. Goodbye. W: Goodbye. Where is Miss Smith?A.
She is at home.
B.
She is having a trip.
C.
She is attending a meeting.
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举一反三
【判断题】在互联网环境中,云服务器ECS上的应用要想被访问到,就必须开通相应的“端口” ,比如常见的HTTP应用工作在80端口,FTP应用工作在21端口,某管理员打算在1台云服务器 ECS 实例上搭建多个应用,为了方便管理,采用了默认的设置,开放全部端口,此管理方式是存在安全隐患的。
A.
正确
B.
错误
【单选题】如图所示电路中,参考电压UR=1V,输出端接双向稳压二极管,其稳定电压UZ=±6V。输入信号为正弦波信号ui=10Sinωt(V)。则输出uo为( )。
A.
6Sinωt(V)
B.
幅值为±6V的矩形波
C.
0V
D.
1V
【简答题】FTP客户端向服务器的PTP端口(默认是21)发送连接请求，服务器接受连接，建立一条命令连接。在建立数据连接时，FTP服务器可以采用(1)和(2)两种工作方式来与FTP客户机建立数据连接。 (1)
【简答题】定性判断一个电路是否能够放大看哪两个方面? 答案: ( 1 )静态时 (直流通路) 放大管是否 有一个 合适的 静态工作点 。 ( 2 )交流时 (交流通路) / 待放大信号输入时 从ui→uo的信号流要能够正确传递。
【单选题】___ principle, I agree that teachers should play a role as a guide.
A.
On
B.
In
C.
Among
D.
At
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