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数据库中有一张表名称为Student，有列Number，Name，Age，IDCard，Sex。主键为Number。要求查询所有男同学信息，下列哪个SQL语句是正确的？（）
A . Select* From Student Where Sex=’男’
B . Select* From Student Where Number NotIn（Select Number From Student Where Sex<>=’男’）
C . Select* From Student Where NumberIn（Select Numbe rFrom Student Where Sex=’男’）
D . Select* From Student Where Sex<>’男&rsquo
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在NBDP通信中呼叫台的9位MMSI将变成Y1Y2Y3Y4Y5Y6Y7识别信号，并形成呼叫字组，其中（）是正确.
A . A、Y1-RQ-Y2，RQ-Y3-Y4，Y5-Y6-Y7
B . B、Y1-a-Y2，a-Y3-Y4，Y5-Y6-Y7
C . C、Y1-a-Y2，Y3-Y4-Y5，a-Y6-Y7
D . D、Y1-RQ-Y2，Y3-Y4-Y5，QR-Y6-Y7
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NBDP以AQR方式通信时，若传输的信息是I am examining now，则分割为（）个信息组发射
A . A、4
B . B、5
C . C、6
D . D、7
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NBDP以ARQ方式通信时，若传输的信息是I am examining now则分割（）_个信息组发射
A . A、4
B . B、5
C . C、6
D . D、7
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有一载频为15MHz的AM、PM、FM波，其调制电压均为v（t）0.5cos210t（V），调角时，频偏fm3kHz，则AM波的带宽为2KHz，FM波的带宽为（），PM波的带宽为8K。
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在GMDSS中，用NBDP设备发安全信息，其电文前应冠有信号为（）.
A . A、JJJ信号和电台
B . B、security和电台
C . C、XXXXXXXXX和电台
D . D、security重复三次和电台
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根据下面所给的AAA数据库，按照下列每种功能写出相应的Transact-SQL语句或程序段
假设使用名称为AAA的数据库，它包括Students（学号char（8），姓名varchar（8），年龄int，专业varchar（20），入学日期DateTime）和Score（学号char（8），课程名varchar（10），成绩numeric（5，2））两张表。将字符串’I am a student’以大写字母显示。
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在NBDP ARQ方式通信过程中，结束通信使用的业务字组是：（）
A . A、BaB
B . B、RQ RQ RQ
C . C、aaa
D . D、aaa约2秒时间
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根据下面所给的AAA数据库，写出下列每条查询语句的执行结果，或者写出下列每条语句或程序段的功能。
假设存在名为AAA的数据库，包括Students（学号char（8），姓名varchar（8），年龄int，专业varchar（20），入学日期DateTime）和Score（学号char（8），课程名varchar（10），成绩numeric（5，2））两张表。SELECT SUBSTRING(‘I am a student’,8,7)
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NBDP以ARQ方式通信时，若传输的信息是“I AM EXAMINING NOW”，则分割成（）个信息组发射。
A . A、4
B . B、5
C . C、6
D . D、7
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数据库中有一张表名称为Student，有列Name，Age，IDCard，Sex。要求查询所有男同学信息，下列哪个SQL语句是正确的？（）
A . Select*FromStudentWhereSex=’男’
B . Select*FromStudentWhereSex<>’女’
C . Select*FromStudentWhereSexLike’男’
D . Select*FromStudentWhereSexIn’男&rsquo
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有一载频为3MHz、最大幅度8V、最小幅度0V的AM波，其调制电压为v（t）0.4cos610t（V）。则AM波的带宽为1Ω电阻上的总功率为（）W。
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设s=’I AM A STUDENT’ , t=’GOOD’ ,则Concat(Substring(s,6,2),Concat(t,SubString(s,7,8)))=( )
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给出源字符串：String str = \i am a student
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听力原文：W: I am sharing a room with three students this semester. Because we come from different countries, we are so different that we aren't getting along very well with each other.
M: We provide a homestay program too. You could choose an American family and live with them next semester.
W: What benefits can a homestay program provide？
M: There are lots of benefits. First, with an American family, the living environment will be relaxing and quiet. Second, you will learn a lot about American culture. Third, it's a perfect way to improve your English. Fourth, you may make good friends with your homestay family. Finally, they will also give you plenty of advice about living in the U. S.
W: Is it expensive to live with an American family？
M: The cost usually runs from $500 to $700 per month, and the contract period may be for a semester or for a year.
W: How should we get along with the host family？
M: Always ask your host family questions when you don't completely understand something, or if you aren't sure that you have understood. Interact frequently with all members of the house- hold and keep good relations with them. Try something new whenever you can, e. g. , food, customs, activities, holiday celebrations, etc.
W: If someone in my host family says something, either out of misunderstanding of or prejudice against my country, what should I do？
M: Don't be angry. Instead, be patient and tactfully educate them about the things they have misunderstood. And remember, always respect others' privacy.
(20)
A．She shares a room with three students and the rent is too high.
B．She isn't getting along well with her roommates.
C．The cost of living with an American family is too high.
D．She feels offended when someone in her host family is prejudiced against her.
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Student A: I am terribly sorry because I left your dictionary in the library and I just couldn't find it there.
Student B:______I have a new one.
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有一载频为3MHz、最大幅度8V、最小幅度0V的AM波，其调制电压为v&61527;（t）&61501;0.4cos6&61552;&61620;10t（V）。则AM波的带宽为1Ω电阻上的总功率为（）W
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单项选择 题 在NBDP ARQ方式通信过程中，结束通信使用的业务字组是：（)。
A、BaB
B、RQ RQ RQ
C、aaa
D、aaa约2秒时间
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Hello,什么 a new student here?什么,I am
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Engineering students are supposed to be examples of practicality and rationality, but when it comes to my college education I am an idealist and a fool. In high school I wanted to be an electrical engineer and, of Course, any sensible student with my aims would have chosen a college with a large engineering department, famous reputation and lots of good labs and research equipment. But that's not what I did.
I chose to study engineering at a small liberal-arts university that doesn't even offer a major in electrical engineering. Obviously, this was not a practical choice; I came here for more noble reasons. I wanted a broad education that would provide me with flexibility and a value system to guide me in my career. I wanted to open my eyes and expand my vision by interacting with people who weren't studying science or engineering. My parents, teachers and other adults praised me for such a sensible choice. They told me I was wise and mature beyond my 18 years, and I believed them.
I headed off to college, feeling sure I was going to have an advantage over those students who went to big engineering "factories" where they didn't care if you had values or were flexible. I was going to be a complete engineer: technical genius and sensitive humanist all in one.
Now I'm not so sure. Somewhere along the way my noble ideals crashed into reality, as all noble ideals eventually do. After three years of struggling to balance math, physics and engineering courses with liberal arts courses, I have learned there are reasons why few engineering students try to reconcile engineering with liberal-arts courses in college.
The reality that has blocked my path to become the typical successful student is that engineering and the liberal arts simply don't mix as easily as I assumed in high school. Individually they shape a person in very different ways; together they threaten to confuse. The struggle to reconcile the two fields of study is difficult.
The author chose to study engineering at a small liberal-arts university because he ______.
A．intended to be a sensible student with noble ideals
B．wanted to be an example of practicality and rationality
C．intended to be a combination of engineer and humanist
D．wanted to coordinate engineering with liberal-arts courses in college
此题为多项选择题。
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听力原文：W: I am worried about Jenny going to college.College students are so wild nowadays.
M: Actually, only a few are like that. Most students are too busy studying to have time to cause trouble.
Q: What does the man imply？
(17)
A．He doesn't want Jenny to get into trouble.
B．He doesn't agree with the woman's remark.
C．He thinks Jenny's workload too heavy at college.
D．He believes most college students are running wild.
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I am an art student and 1 paint a lt f pictures. （)
A．他们总是告诉你一幅画的“意思”是什么。
B．有很多人装成很懂现代艺术的样子,
C． 我是个学艺术的学生，画了很多画。
D．它们就是些好看的图案。
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写一程序统计字符串“ I am a student ”的长度和字母 a 出现的次数。 （）
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打靶3发，事件Ai表示“击中i发”（i=0,1,2,3)，则事件A1+A2+A3表示（)。
A．全部击中
B．至少击中一发
C．击中3发
D．至多击中3发
