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【单选题】
以下关于ICMP报文结构的描述中,错误的是
A.
TCP报中协议字段值为1表示网络层数据部分是ICMP报文
B.
ICMP报文的前4B的格式是统一的
C.
ICMP报文的第三个字段（2B）是校验和
D.
ICMP报文的第四个字段（4B）的内容与类型相关
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参考解析：
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【多选题】二极管按用途来分有()二极管、()二极管、()二极管、()二极管等。
A.
整流
B.
稳压
C.
发光
D.
光电
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【判断题】二极管按用途分可分为普通二极管、特殊二极管和变容二极管。( )
A.
正确
B.
错误
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【单选题】对接受者有利,同时对释放者有利的信息素是( )
A.
防卫信息素
B.
利他素
C.
拮抗素
D.
互利素。
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【简答题】二极管按用途分为 、 两类。
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【单选题】听力原文：W：If you're in a hurry you can take the subway. If you want to sightsee，take a bus． M：Actually，I don't have to be at the convention before noon． Q：What will the man probably do? (19)
A.
Take the subway.
B.
Take a bus.
C.
Take a taxi.
D.
Hurry to the convention.
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【单选题】听力原文：W. Lovely day, isn't it? M: Oh, yeah, beautiful. W: You're not English, are you? How long have you been learning English? M: No, I'm from Italy. But my mother was born and brought up in England. ...
A.
Italy.
B.
Greece.
C.
England.
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【单选题】Interviewer：Sorry for the inconvenience it may cause you.Interviewee：__________．
A.
You’re welcome
B.
Never mind
C.
Nothing else
D.
It’s OK
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【简答题】半导体二极管按用途分为: 普通 二极管、()二极管、()二极管和 开关 二极管。
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【单选题】听力原文：W: Hello, Gary. How're you? M: Fine! And you? W: Can't complain. Did you have time to look at my proposal? M: No, not really. Can we go over it now? W: Sure. I've been trying to come up with some...
A.
The benefits of strong business competition.
B.
A proposal to lower the cost of production.
C.
Complaints about the expense of modernization.
D.
Suggestions concerning new business strategies.
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【简答题】二极管按用途分主要有普通二极管、（）二极管、开关二极管、稳压二极管、光电二极管、（）二极管等。
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相关题目：
【多选题】二极管按用途来分有()二极管、()二极管、()二极管、()二极管等。
A.
整流
B.
稳压
C.
发光
D.
光电
查看完整题目与答案
【判断题】二极管按用途分可分为普通二极管、特殊二极管和变容二极管。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】对接受者有利,同时对释放者有利的信息素是( )
A.
防卫信息素
B.
利他素
C.
拮抗素
D.
互利素。
查看完整题目与答案
【简答题】二极管按用途分为 、 两类。
查看完整题目与答案
【单选题】听力原文：W：If you're in a hurry you can take the subway. If you want to sightsee，take a bus． M：Actually，I don't have to be at the convention before noon． Q：What will the man probably do? (19)
A.
Take the subway.
B.
Take a bus.
C.
Take a taxi.
D.
Hurry to the convention.
查看完整题目与答案
【单选题】听力原文：W. Lovely day, isn't it? M: Oh, yeah, beautiful. W: You're not English, are you? How long have you been learning English? M: No, I'm from Italy. But my mother was born and brought up in England. ...
A.
Italy.
B.
Greece.
C.
England.
查看完整题目与答案
【单选题】Interviewer：Sorry for the inconvenience it may cause you.Interviewee：__________．
A.
You’re welcome
B.
Never mind
C.
Nothing else
D.
It’s OK
查看完整题目与答案
【简答题】半导体二极管按用途分为: 普通 二极管、()二极管、()二极管和 开关 二极管。
查看完整题目与答案
【单选题】听力原文：W: Hello, Gary. How're you? M: Fine! And you? W: Can't complain. Did you have time to look at my proposal? M: No, not really. Can we go over it now? W: Sure. I've been trying to come up with some...
A.
The benefits of strong business competition.
B.
A proposal to lower the cost of production.
C.
Complaints about the expense of modernization.
D.
Suggestions concerning new business strategies.
查看完整题目与答案
【简答题】二极管按用途分主要有普通二极管、（）二极管、开关二极管、稳压二极管、光电二极管、（）二极管等。
查看完整题目与答案