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发布时间:2024-01-01 20:08:04

[不定项选择题]受某高速公路建设指挥部委托,某省交通科学研究院股份有限公司对该高速公路第3合同的某隧道右洞二次衬砌厚度进行了无损检测,采用了目前最为常用的地质雷达法。检测前,应选择检测仪器(注意天线选型)并对衬砌混凝土的介电常数和电磁波速做现场标定等工作。一般的媒质介电常数见下表。(4)地质雷达主机通过天线,在隧道衬砌表面向内部发射频率为数百兆赫的电磁波,当电磁波遇到不同媒质的界面时便会发生反射与透射,反射波返回衬砌表面,又被接收天线所接收(发射与接收为同一天线),此时雷达主机记录下电磁波从发射到接收的双程旅行时间t-10ns。试求出初衬厚度( )。
A.A:0.1m
B.B:0.5m
C.C:1.5m
D.D:1m

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A.用摆式仪测得的摆值表征的是路面抗滑能力
B.颠簸累积仪所测结果表示的是路面平整度指标,单位是mm
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[不定项选择题]某高速公路建设单位组织沥青路面的交工验收,请回答以下问题:(5)进行路面宽度检测,以下正确的是()。
A.路面宽度包括行车道、路缘带、变速车道、爬坡车道、硬路肩和紧急停车带的宽度
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[不定项选择题]某高速公路建设单位组织沥青路面的交工验收,请回答以下问题:(1)检测的关键项目包括()。
A.弯沉值
B.平整度
C.压实度
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[不定项选择题]共用题干 Animal's “Sixth Sense”
A tsunami(海啸)was triggered(引发)by an earthquake in the Indian Ocean in December, 2004.It killed tens of thousands of people in Asia and East Africa. Wild animals,1, seem to have escaped that terrible tsunami. This phenomenon adds weight to notions that they possess a“sixth sense” for2 ,experts said.
Sri Lankan wildlife officials have said the giant waves that killed over 24,000 people along the Indian Ocean island's coast clearly 3 wild beasts,with no dead animals found.
“No elephants are dead,not4a dead rabbit. I think animals can5 disaster.
They have a sixth sense. They know when things are happening,” H. D. Ratnayake,deputy director of Sri Lanka's Wildlife Department,said about one month after the tsunami attack. The6washed floodwaters up to 2 miles inland at Yala National Park in the ravaged(被 毁坏的)southeast, Sri Lanka's biggest wildlife7and home to hundreds of wild elephants and several leopards(豹).
“There has been a lot of8 evidence about dogs barking or birds migrating before volcanic eruptions(火山爆发)or earthquakes. But it has not been proven ,” said Matthew van Lierop,an animal behavior 9 at Johannesburg Zoo.
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“Wildlife seem to be able to pick up certain12 ,especially birds…there are many re- ports of birds detecting impending(迫近的)disasters , ” said Clive Walker , who has written several books on African wildlife.
Animals13 rely on the known senses such as smell or hearing to avoid danger such as predators(食肉动物).
The notion of an animal “sixth sense”一or14other mythical power一is an enduring one which the evidence on Sri Lanka's ravaged coast is likely to add15. 9._________
A.specialist
B.guy
C.supporter
D.sponsor

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