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【单选题】
在PC机使用传统电话线拨号上网时,要使用调制解调器,其作用是( )。
A.
将数字信号转换为模拟信号
B.
将模拟信号转换为数字信号
C.
将一种模拟信号转为另一种摸拟信号将一种模拟信号转为另一种摸拟信号
D.
将一种数字信号转换为另一种数字信号
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举一反三
【单选题】下列关于电子邮箱的说法中,错误的是()
A.
有免费的电子邮箱、也有收费的电子邮箱
B.
只能在网易网站中申请电子邮箱
C.
电子邮箱的密码尽量使用字母、数字的复杂组合
D.
在不同网站申请的电子邮箱可以使用同一个用户名
【单选题】“上与下”是阴阳学说基本内容的哪一种?
A.
阴阳对立制约
B.
阴阳互根互用
C.
阴阳消长
D.
阴阳转化
【单选题】Not until _______ 18 years old _______ a right to vote.
A.
have you reached; can you have
B.
have you reached; you can have
C.
you have reached; can you have
D.
you have reached; you can have
【单选题】A: ____ I help you? B: A cap, please. [     ]
A.
What
B.
Can't
C.
Can
【单选题】—___________. —Yes, please. I'd like to buy a cap. [     ]
A.
Can I help you?
B.
Can you help me?
C.
Is that all?
【单选题】If you can’t put a cap on it, you’re chasing the wind.
A.
If you can’t constrain (限制) your desires, you’re following the crowd.
B.
If you can’t put a limit on what you desire, you are undertaking a meaningless task that will lead you nowhere.
【单选题】If you can't put a cap on it, you're chasing the wind.
A.
If you can't put a limit on what you desire, you are undertaking a meaningless task that will lead you nowhere.
B.
If you can't constrain(限制) your desires, you're following the crowd.
【简答题】I How are you? What color are your shoes? Is your cap on the desk? Does your friend have long black hair? What’s wrong with you? II A. Yes, it is. B. I can’t find my keys. C. Yes, she does. D. N...
【单选题】下列关于电子邮件的说法错误的是
A.
互联网的电子邮件的邮件头由收信人电子邮箱地址、邮件标题和发信人电子邮箱地址组成 。
B.
Macro Express 是电子邮件客户端程序 。
C.
在电子邮件服务中包括发信和收信两个过程。它们是相互独立的,每个过程分别使用一种协议。SMTP和POP3就是目前最普遍使用的发信和收信协议。
D.
电子邮件服务是一种通过计算机网络与其他用户进行联系的快速、简便、高效、价廉的现代化通信手段。
【简答题】Philip:I can’t believe I 2 you at last.And what have you been doing?
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