未知题型
地下燃气管道埋设在机动车不能到达地方时，最小覆土厚度不得小于（ ）m。
- A.0．3
B.0．5
C.1．2
D.1．5
【参考答案】
A
本题考核的是地下燃气管道埋设的最小覆土厚度。地下燃气管道埋设的最小覆土厚度(路面至管顶)应符合下列要求：埋设......
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单项选择题
Should the U.S. halt human space flight? The Columbia accident has revived the debate on whether the rewards of human space exploration are worth the risks.No. I was a teacher when men first landed on the moon in 1969, and I remember how it moved my students and this country.___________(46) And we haven't ventured outward since then. That's 30 years too long! America's human space-flight program is adrift, with no clear vision or goals beyond the completion of the International Space Station.I want NASA to establish a phased series of goals over the next 20 years, including human visits to asteroids that cross the Earth's orbit, establishing a research and living facility for humans on the moon, and human expeditions to the surface of Mars and its moons.___________(47)An astronaut is today's Christopher Columbus, who sailed into the unknown and discovered the Americas. The knowledge we gain from having actual people exploring can never be replaced by robots.___________ (48) Robots are useful, but humans can do things that robots can't.The real obstacle we face in overcoming the drift in the nation's human space-flight program is not technological and it's not financial.___________ (49)The lesson from the Columbia accident is not that humans don't belong in space.___________ (50) A．Instead, we should honor the memory of the lost astronauts by pushing our exploration of space future.B．Astronauts are key to this expanded exploration.C．It's the lack of commitment to get started.D．Until then, we should stop risking people's lives by sending them into space.E．It is now more than 30 year since the last American left the surface of the moon and returned to Earth.F．Our ability to send humans into space and have them return gives us amazing information about ourselves and our universe. 第 46 题 请选择（46）处的最佳答案．
A.S.
B.
No.
C.___________(46)
D.
I
E.___________(47)
An
F.___________
G.
The
H.___________
I.___________
J.Instead,
K.
B．Astronauts
L.
C．It's
M.
D．Until
N.
E．It
O.
F．Our
P. -
未知题型
（二）【背景资料】某城市道路改造工程，随路施工的综合管线有0．4MPa的DN500mm中压燃气、DN1000mm给水管并排铺设在道路下，燃气管道与给水管材均为钢管，实施双管合槽施工。热力隧道工程采用暗挖工艺施工。承包方A公司将工程的其中一段热力隧道工程分包给B公司，并签了分包合同。B公司发现土层松散，有不稳定迹象，但认为根据已有经验和这个土层的段落较短，出于省事省钱的动机，不仅没有进行超前注浆加固等加固措施，反而加大了开挖的循环进尺，试图“速战速决，冲过去”，丝毫未理睬承包方A公司派驻B方现场监督检查人员的劝阻。结果发生隧道塌方事故，造成了3人死亡。事故调查组在核查B公司施工资格和安全生产保证体系时发现，B公司根本不具备安全施工条件。【问题】1．燃气管与给水管的水平净距有何要求?2．试述燃气管道强度试验的压力、稳定时间及合格标准。3．对发生的安全事故，A公司在哪些方面有责任?4．B公司对事故应该怎么负责?
A.4MPa的DN500mm中压燃气、DN1000mm给水管并排铺设在道路下，燃气管道与给水管材均为钢管，实施双管合槽施工。热力隧道工程采用暗挖工艺施工。承包方A公司将工程的其中一段热力隧道工程分包给B公司，并签了分包合同。
B公司发现土层松散，有不稳定迹象，但认为根据已有经验和这个土层的段落较短，出于省事省钱的动机，不仅没有进行超前注浆加固等加固措施，反而加大了开挖的循环进尺，试图“速战速决，冲过去”，丝毫未理睬承包方A公司派驻B方现场监督检查人员的劝阻。结果发生隧道塌方事故，造成了3人死亡。
事故调查组在核查B公司施工资格和安全生产保证体系时发现，B公司根本不具备安全施工条件。
【问题】
1．燃气管与给水管的水平净距有何要求?
2．试述燃气管道强度试验的压力、稳定时间及合格标准。
3．对发生的安全事故，A公司在哪些方面有责任?
4．B公司对事故应该怎么负责? -
单项选择题
A．writtenB．called C．identifiedD．seen
A.written
B．called
B.identified
D．seen
