使用前缘缝翼提高临界迎角的原理是().A、加快机翼前缘上表面的气流流速,在前缘形成吸

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问题:

使用前缘缝翼提高临界迎角的原理是().

A、加快机翼前缘上表面的气流流速,在前缘形成吸力峰。

B、减小机翼下翼面气流的流速,增大上下翼面的压力差。

C、加快附面层内气流的流速,使分离点后移。

D、加快附面层内气流的流速,使分离点前移。

考点:民用航空器维修执照考试M8空气动力学M8空气动力学题库
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有机磷农药中毒时,污染部位的清洗要用()

A.热水

B.酒精

C.肥皂水

D.硼酸

E.碳酸氢钠

题型:单项选择题
My husband and I arrived in a new country just a month ago,  We were sort of   16  about what was waiting for us, However, when we   17  at the airport ,a tall man with smiling eyes greeted us, The days and months were    18  made easy for us by this kind man.
He greeted us every day with his smiling face, He    19  us in going to the bank; in buying our groceries, in telling us    20  to buy almost everything , He told us he is our big brother.
   21  , we watched the match in a coffee shop, During the first get- together ,he    22  us that we’re lucky-my husband and I are   23  in this foreign land, He said he has been   24  for eight years now because he rarely sees his family,   25  they are in his home country.
During the second get-together, he   26  told us that we are his family , He said that he loves us and that he will    27  us because he has been given a    28  of 45 days to go back to his home country, That night, he spoke these words which   29  a great impact in my life:“You changed my life ……”
That night deep in our hearts we were    30  by our friend’s words, We texted him up-on reaching home,   31  him for being a Big Brother to us in the foreign land, We told him    32  that we feel safe in going out when we are with him, to which he    33  ,“You are my family here.”
On the first week of October, we’re going to    34  him back from his vacation, We’ll watch the football match again in that   35  shop that holds dear memories.
小题1:
A.curiousB.worriedC.certainD.crazy
小题2:
A.checkedB.droppedC.landedD.settled
小题3:
A.thereforeB.insteadC.anyhowD.otherwise
小题4:
A.expectedB.troubledC.comfortedD.accompanied
小题5:
A.whenB.whereC.whyD.whether
小题6:
A.OnceB.SoC.TwiceD.Finally
小题7:
A.informedB.warnedC.blamedD.convinced
小题8:
A.togetherB.nearbyC.aroundD.apart
小题9:
A.sickB.lonelyC.cheerfulD.scared
小题10:
A.ifB.unlessC.asD.although
小题11:
A.secretlyB.jokinglyC.proudlyD.sincerely
小题12:
A.rememberB.missC.forgetD.respect
小题13:
A.delayB.missC.vacationD.date
小题14:
A.createdB.designedC.solvedD.received
小题15:
A.puzzledB.touchedC.astonishedD.flattered
小题16:
A.thankingB.forgivingC.repayingD.punishing
小题17:
A.after allB.as wellC.in returnD.in advance
小题18:
A.agreedB.objectedC.addedD.replied
小题19:
A.seeB.pickC.callD.force
小题20:
A.bookB.groceryC.coffeeD.sports
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循行于背部的经脉是()

A.足太阴经

B.足少阴经

C.足太阳经

D.足阳明经

E.手厥阴经

题型:单项选择题

颈椎骨折进行颅骨牵引时取

A.端坐位
B.仰卧屈膝位
C.截石位
D.头低足高位
E.头高足低位

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论述电子商务对我国经济社会的影响?

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