地压现象是()产生的。A、没有掘进巷道以前,上部岩石用本身的重量压着下部岩石,下部岩

题型:多项选择题

问题:

地压现象是()产生的。

A、没有掘进巷道以前,上部岩石用本身的重量压着下部岩石,下部岩石对上部岩石的压力产生反作用力,这种压力与反作用力处于一种平衡状态,故岩体内任意一点上的应力都是平衡的

B、巷道开挖以后,破坏了原岩应力的平衡状态,巷道周围的岩石受力情况发生了变化,围岩应力重新分布,所有的地区都会升高

C、一般说来,由于力的不平衡,会使巷道周围岩石发生变形、破坏甚至冒落

D、试验和实践证明,在岩体中掘进巷道后,巷道周边围岩会产生明显的应力集中现象,即巷道周边围岩承受的应力是原岩应力的数倍。如果巷道围岩重新分配的应力没有超过岩体的强度,则围岩只产生轻微的变形及位移;如果超过岩体强度,则该处的围岩就会破坏

考点:非煤矿山考试非煤矿山负责人安全资格考试非煤矿山负责人安全资格考试题库
题型:多项选择题

对新生儿用导尿管吸引鼻孔时,会出现皱眉、啼哭、弹打四肢等,下面哪些情况可无此现象()。

A.中枢神经损伤

B.足月儿

C.酸中毒

D.产妇用药后

E.先天性肌病

题型:多项选择题

“I’m a little worried about my future.”said Dustin Hoffman in The Graduate.He should be so lucky.All he had to worry about was whether to have an affair with Mrs. Robinson.In the sixties,that was the total sum of post-graduation anxiety.

Hoffman’s modem peers are not so fortunate.The Mrs. Robinsons aren’t sitting around at home any more.They are out in the workplace,doing the high-powered jobs the graduates want,but cannot get.For those fresh out of university,desperate for work but unable to get it,there is a big imbalance between supply and demand.And there is no narrowing of the gap in sight.

Parents feel as badly let down as the young people themselves.Middle-class families see their graduate offspring on the dole (救济金) queue and wonder why they bothered paying school fees.Working-class families feel an even keener sense of disappointment.For many such families,getting a child into university was the fulfillment of a lifelong dream.It was proof that they were living in a dynamic,economically successful country.That dream does not seem so rosy now.Graduate unemployment is not,ultimately,a political problem.Job-creation for graduates is very low down in the government’s schedule.If David Cameron’s Conservatives (保守党) had a brilliant idea for guaranteeing every graduate a well-paid job,they would have presented it by now.It is a social problem,though a more deep-seated social problem than people perhaps realize.

小题1:The author begins with the lines from The Graduate in order to __________ .

A.support the fact that more women are working now

B.show that few graduates started working right after graduation

C.demonstrate that there were much fewer graduates than now

D.emphasize the sharp contrast between now and then小题2:Regarding job opportunities for young graduates,the author sounds __________ .

A.pessimistic

B.hopeful

C.unconcerned

D.content小题3:The main purpose of the passage is to __________ .

A.criticize the government

B.present a current severe situation

C.publicize a movie

D.display the success of the country小题4:Towards the end of the passage,the author implies that __________ .

A.there will be job-creation programs for graduates

B.graduate unemployment is more of a political issue

C.graduate unemployment is not likely to be solved in a short time

D.the Conservatives have done nothing to solve the issue

题型:多项选择题

病人应首先查

A.血常规

B.腹部X线

C.腹部B超或CT

D.FTC

E.ERCP

题型:多项选择题

海洋功能食品的功能因子有哪些?海洋功能食品的生理功能是什么?

题型:多项选择题

某建筑企业安全生产许可证有效期满后不顾建设行政主管部门关于限期补办延期手续通知要求,继续从事生产活动,终于导致了重大事故的发生。

《安全生产许可证条例>第九条规定:安全生产许可证有效期满需要延期的,企业应当于期满前()个月向原安全生产许可证颁发管理机关办理延期手续。

A.1

B.2

C.3

D.4

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