经验认为某个解释与其他解释变量间多重共线性严重的情况是这个解释变量的VIF()。A.

题型:单项选择题

问题:

经验认为某个解释与其他解释变量间多重共线性严重的情况是这个解释变量的VIF()。

A.大于

B.小于

C.大于5

D.小于5

考点:经济学计量经济学计量经济学题库
题型:单项选择题

(6分)取一小块金属钠,用滤纸吸干表面的煤油,用小刀切开后,可看到断面呈___________色,具有________光泽,但断面很快变_________,主要是由于生成一薄层________________。若把钠水中,其反应的化学方程式为_____________________________。

题型:单项选择题

第二节 完形填空(共20小题;每小题1.5分,共30分)

阅读下面短文,掌握其大意,从每题所给的A、B、C、D四个选项中,选出最佳选项,并在答题卡上将该项涂黑。

Nearly two decades has passed , I still remember my favourite professor, James Sehwartz. Whenever he smiles ,it’s as if you’d just been told the funniest joke on earth .Almost all his students are his friends, and almost all his students know his life story.

When James was a teenager ,his father   36   him to a fur factory where he worked . This was during the Great Depression. The   37  was to get James a job.

He entered the factory ,and immediately felt as if the   38   had closed in around him. The room was dark and hot , the windows covered with dust, and the   39   were packed tightly together ,running like trains. The fur hairs were flying ,   40   a thickened air ,and the workers,

41   the pieces of fur together , were bent over their needles   42  the boss marched up and down the rows ,searching for them to go faster .James could hardly   43  . He stood next to his father ,frozen with fear ,hoping the boss wouldn’t   44  at him , too.

During lunch break ,his father took James to the boss and pushed him in front of him,   45 if there was any work for his son. But    46  there was barely enough  47  for the adult labours ,for no one would give it up once he takes a job.

Thus , for James, it was a   48  . He hated the place. He made a   49  that he kept to the end of his like: he would never do any work that brought    50  to someone else ,and he would never allow himself to    51   money off the seat of others.

“What will you do?” his mother , Eva , would ask him.

“I don’t know,” he   52  say. He ruled out law ,because he didn’t like  53   , and he ruled out medicine , because he couldn’t take the    54  of blood.

“What will you do?”

55  , my best professor I ever had became he thought it was the job not to hurt anybody.

36.A.sent          B.took         C.carried      D.admitted

37.A.situation      B.condition     C.idea      D.way

38.A.lights              B.doors         C.chances     D.walls

39.A.goods          B.workers       C.machines  D.vehicles

40.A.creating       B.sending        C.taking       D.disturbing

41.A.collecting     B.pulling        C.drawing    D.sewing

42.A.as            B.after         C.if         D.though

43.A.breathe        B.see           C.walk     D.hear

44.A.attack          B.scold         C.rush     D.scream

45.A.doubting      B.questioning      C.asking      D.demanding

46.A.also          B.still          C.yet       D.even

47.A.time         B.work         C.office          D.occupation

48.A.comforting      B.regretting     C.blessing    D.forgiving

49.A.request        B.promise       C.plan     D.arrangement

50.A.harm         B.injury          C.damage     D.inconvenience

51.A.pay          B.save         C.make     D.let

52.A.should         B.would          C.could     D.might

53.A.police          B.lawyers        C.judges      D.government

54.A.sight         B.feel          C.sense     D.scenery

55.A.Generally     B.Luckily        C.Eventually       D.Basically

题型:单项选择题

(病例一)患儿男性,6个月大。双侧完全性唇腭裂,否认家族中有类似病史,临床表现提示可能患有某种全身发育畸形综合征。

腭裂发生于胚胎的时间是()

A.第9周以后

B.第3周

C.第6周

D.第7周

E.第8周

题型:单项选择题

下列选项不是诊断卵巢妊娠的必备条件的是()

A.盆腔有出血

B.双侧输卵管完整

C.囊胚壁上有卵巢组织

D.囊胚位于卵巢组织内

E.卵巢与囊胚以固有韧带与子宫相连

题型:单项选择题

以下关于保修费用处理的说法不正确的是( )。

A.承包单位未按设计要求施工,造成的质量缺陷,由承包单位负责返修并承担经济责任
B.由于设计方面的原因造成的质量缺陷,由设计单位承担经济责任
C.因建筑材料、建筑构配件和设备质量不合格引起的质量缺陷,均由承包单位承担经济责任
D.因不可抗力造成的损坏问题,由建设单位负责处理

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