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【单选题】
How does a presidential press conference work? On TV you see a roomful of people. But out of two hundred or more present, fifty will be White House staffers who have come to observe and another twenty-five will be technicians. Of those left, ninety-odd will be reporters with White House press passes who have no intention of asking a question. (They come because it is important that they be seen by an editor at home.) That leaves some thirty-five regulars, those who travel with the President and who ask the questions. The seating at a press conference is not by accident. The regulars have marked seats in the first three or four rows, and beyond that the seating is on a first-come, first-served basis. In a way that no one talks about, this allows a press secretary to let you know about his or the President's displeasure. If a reporter who has been in the front row walks in one day and finds he is sitting five rows back, he knows what has happened. This fixed seating allows the President to know who is sitting where. Johnson studied the charts, and Nixson always knew where the reporters who mattered, in his view, were seated. He knew where he could go if he needed to change the subject. The lack of follow-up to an answer has always been one of the flaws of the press conference format. The press corps has never done a good job on it. I tried to go into a press conference with five questions I would like to ask, and a backup list of five more. But I had to be ready to follow up someone else's question. There are other weaknesses in press conferences, of course, among them the fact that ninety-nine percent of the questions are political. Such issues as genetic-engineering, overpopulation, the global economy do not often get raised. We have not figured out yet what our responsibility should be reporting these issues before they get to be such immense problems. Ideally, a presidential news conference should be held every ten days to two weeks, live, in an unstructured seating. Television works best when it puts you there, in a situation where the camera has the least influence on the person. With our improvement in technology, we are coming to that point soon. The new minicams spit our broadcast-ready videotape on the spot. According to the passage, at a presidential press conference of about 200 people, will be reporters.
A.
seventy-five
B.
ninety-odd
C.
thirty-five
D.
some a hundred and thirty
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【单选题】设数据比特序列为1101011011,生成多项式为 G(X)=X4+X+1,则CRC校验码为( )。
A.
1001
B.
1010
C.
1011
D.
1110
【简答题】(8分)烟花爆竹的主要成分是黑火药,其化学组成为硝酸钾、硫磺和木炭等。 (1)黑火药中至少有_______种元素,欲分离出硝酸钾,可进行______、过滤、蒸发结晶等操作。 (2)黑火药的一般配方是:硫磺2 g、硝酸钾3 g、炭粉4. 5 g。已知黑火药在空气中燃爆时可发生:S + 2KNO 3 + 3C = K 2 S + 3CO 2 ↑+ N 2 ↑,则S、KNO 3 、C完全反应时的质量比为...
【单选题】一直二进制信息码为110011,设其生成多项式G(X)=X4+X3+1,若按CRC方式,发送方发送的二进制序列是()
A.
1100110101
B.
1110001100
C.
1100111001
D.
1100011010
【单选题】表格也是网页中常用的组成元素,为一系列行和列构成的网格,最小单位为:
A.
B.
C.
单元格
D.
区域
【单选题】设数据比特序列为"10110",生成多项式为 G(X)=X4+X+1,则CRC校验码为
A.
10011
B.
10101
C.
1010
D.
1111
【单选题】注射( )而使机体产生的免疫力称为人工被动免疫。
A.
疫苗
B.
菌苗
C.
类毒素
D.
血清
【多选题】amuse 的同根词有 __________ 。
A.
music
B.
amusement
C.
musical
D.
musician
【单选题】设CRC生成多项式为G(x) = x4 + x + 1,数据帧1010 1100的CRC校验码为()。
A.
0011
B.
1001
C.
011
D.
110
【简答题】选做题:现假设选择的CRC生成多项式为 G ( X ) = X 4 + X 3 + 1 ,发送数据二进制序列为10110011。求出最终带CRC校验码的发送数据比特序列。
【单选题】注射( )而使机体产生的免疫力称为人工被动免疫。
A.
疫苗
B.
菌苗
C.
类毒素
D.
高免血清
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