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【多选题】
下 列关于灌筑桩水下混凝土灌注用导管要求的选项中,说法正确的是( )。A.
导管直径20～30cm，节长3m
B.
导管不得漏水，试压的压力底静水压力的1．2倍
C.
导管采用法兰盘接头宜加锥形活套
D.
导管轴线偏差不宜超过的0．5％，且不宜大于lOcm
E.
采用螺旋丝扣型接头时必须有防止松脱装置
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【简答题】HDB3码为-1 0 0 -1 +1 0 0 0 +1 -1 +1 -1 0 0 -1 +1，原信息代码为（ ）。
【单选题】HDB3 码 +1 0 0 0 +v -1 0 0 0 -v +1 -1 +1 0 0 +v -1 +1, 那么其对应的原始消息代码为()。
A.
1 0 0 0 1 0 0 0 0 0 1 0 1 0 0 1 0 1
B.
1 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 1 1
C.
1 0 0 0 1 1 0 0 0 1 1 1 0 0 0 0 1 1
D.
1 0 0 0 0 1 0 0 0 1 0 1 0 0 0 1 0 1
【单选题】HDB3 码“+ 0 - + 0 0 0 + 0 0 0 - + - 0 0 - 0 0 0 +”进行译码的结果是______。444
A.
101100010001110010001
B.
101100010001100010001
C.
101100000001110010001
D.
101100000001100000001
【单选题】Dialoge 2(P35) Listen to a dialogue between the police officer and the man who reports a theft.Listen once to get the main idea.Listen again and choose the best answer to each of the following questio...
A.
At a park
B.
In a shopping center
C.
Not known
【判断题】Listen again and check (✔) the reasons why Jason feels satisfied with his present job. 1 He has a big office.
A.
正确
B.
错误
【单选题】Listen to the interview presented by "Visions of the Future".Listen once to get the main idea.Listen again and choose the best answer to each of the folling questions. (Dialogue 3 P19) 1.What is the t...
A.
City growth and planning in the 21st century.
B.
Population growth in the 21st century.
C.
Transport designing in the 21st century.
【简答题】已知信息代码为 1 0 0 0 0 0 0 0 0 0 1 1，求相应的AMI码、HDB3码、PST码及双相码。
【简答题】已知HDB3码为码为-1 0 1 -1 0 0 -1 1 -1 1 0 0 0 1 -1 0 1 -1，与之对应的原单，与之对应的原单极性二进制码序列为（）。
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