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A道桥集团公司中标总承包城市立交桥综合改造工程，除拓宽道路增加城市绿化带外，还增设了桥区的排水系统和燃气管道。燃气和排水管道工程由发包方直接分包给专业施工方。施工期间不能断绝交通，项目部制定了分段导行方案。 排水管道顶管施工时，钢木组合结构的顶管工作井侧壁倒塌，造成二死一伤的事故。分析认为井的撑焊接不牢、未设置八字形钢斜撑是引发事故的主要原因；事故调查发现：安全检查表有A道桥集团公司项目部安全生产会议提出的加固具体建议记录，但分包方未能及时加固消除隐患。 专业施工方应与谁签订分包合同？
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【简答题】制备肉桂酸时,往往出现焦油,它是怎样产生的?又是如何除去的? 5 、试描述制备对氨基苯磺酸的反应原理。
【单选题】Man is the only【B1】that laughs. Why is this true? What makes us respond as we do to pleasurable experiences? What is the history of this 'happy convulsion', as someone once【B2】it, and just what is its...
A.
beast
B.
animal
C.
creatures
D.
microorganism
【单选题】According to the man, why do modern books decay?
A.
They are often handled improperly by readers.
B.
The paper is destroyed by chemicals.
C.
The ink used in printing damages the paper.
D.
The glue used in the binding loses its strength.
【简答题】什么叫做平面汇交力系？
【简答题】当三极管的基极电流 I b 由0.02mA增加到0.04mA时,相应的集电极电流 I c由1mA增加到2.2mA,则三极管的交流电流放大倍数β=( )。
【单选题】当三极管的基极电流Ib 由20微安增加到40微安时，相应的集电极电流Ic由1mA增加到2.2mA，则三极管的交流电流放大倍数β=（ ）?
A.
60
B.
1/60
C.
0.06
D.
6
【简答题】听下面一段对话，回答第1-3题。 1. Why do the students write to the man? A. They want his records. B. They want him to teach them. C. They hope to talk to him at school. 2. What's the man? A. A successful reporter. ...
【简答题】语言是人类交际的重要工具之一,它是由语音、( )、( )三个要素构成。
【单选题】According to the man, why do the elderly not like using the computerized banking services?
A.
Because they feel it strange to use computers and don't want to ask for help.
B.
Because they can not deal with all me modern things by themselves.
C.
Because they don't trust computers or machines at all.
D.
Because they can not easily find someone to help them use computers.
相关题目：
【单选题】当三极管的基极电流Ib 由20微安增加到40微安时，相应的集电极电流Ic由1mA增加到2.2mA，则三极管的交流电流放大倍数β=（ ）?
A.
60
B.
1/60
C.
0.06
D.
6