在(1+x)n(n∈N*)的二项展开式中,若只有x5系数最大,则n=______

题型:填空题

问题:

在(1+x)n(n∈N*)的二项展开式中,若只有x5系数最大,则n=______.

考点:二项式定理与性质
题型:填空题

如图属于光的折射的是(  )

A.

B.

C.

D.

题型:填空题

女性,32岁。月经增多伴发热2周,血红蛋白50g/L,白细胞3.2×109/L,血小板30×109/L,骨髓象成熟红细胞与有核细胞比为100:1,该病诊断为()

A.急性白血病早期

B.急性再生障碍性贫血

C.急性ITP伴缺铁性贫血

D.类白血病反应

E.粒细胞缺乏症早期

题型:填空题
Our three-year-old daughter Becky wanted a dog. But we were too busy to buy one. One day, Becky ran in, shouting, “Mom! Come to see my dog!” Her face was red with   36 .
  I followed her to the bush and found a   37 ! He was hurt. Seeing me, he stood up   38 ! I could see his teeth! God! My mouth felt dry. “Don’t be afraid. That’s Mom. She  39 you, too.” Becky said. Then he became friendly. It was  40 !
  I   41  to find my husband and told him about the wolf. We should have  42  the wolf, but Becky loved him. Besides, he was gentle(温柔的) to Becky. So we called the vet finally.
  Becky named the wolf (狼) Ralph ,  43  she carried food to him every day. Later, Ralph got well. They played together in the daytime. At night, Ralph would return to the mountains. Sometimes he   44  but came back several days later.
  On Becky’s first day of school, we could see Ralph’s   45 . After the school bus left, Ralph lay by the side of the road and   46  . When Becky returned, he got happy again. This    47  throughout Becky’s school years.
  Twelve   48  passed.
  One day we heard that a she-wolf was killed. The other wolf was hurt and ran away. We were   49  about Ralph. That night, Ralph returned with a wound (伤). Fifteen-year-old Becky held his head and   50  him. We hope he could come through. However, he   51 .
  Becky cried. I noticed something strange in the bush — two little yellow eyes! Ralph’s  52 ! Before he died, Ralph   53  his child to us! He knew he would be  54  here, as he had been. Ralph, Ralph... I was   55 .
  “Don’t be afraid, little ... Ralphie. That’s Mom. She loves you, too.”
小题1:
A.encouragementB.entertainmentC.agreementD.excitement
小题2:
A.dogB.foxC.wolf D.tiger
小题3:
A.lovelyB.finallyC.suddenlyD.patiently
小题4:
A.hurtsB.lovesC.killsD.hates
小题5:
A.wonderfulB.unhappyC.unbelievableD.normal
小题6:
A.preparedB.rushed C.pretendedD.wanted
小题7:
A.lovedB.foundC.damagedD.killed
小题8:
A.andB.butC.soD.or
小题9:
A.disappearedB.turnedC.passedD.came
小题10:
A.sadnessB.dreamC.understandingD.anger
小题11:
A.sleptB.leftC.sangD.waited
小题12:
A.stoppedB.joinedC.livedD.continued
小题13:
A.daysB.weeksC.monthsD.years
小题14:
A.surprisedB.puzzledC.worriedD.careful
小题15:
A.comfortedB.beatC.washedD.amused
小题16:
A.succeededB.diedC.criedD.woke
小题17:
A.motherB.fatherC.wifeD.child
小题18:
A.postedB.broughtC.soldD.threw
小题19:
A.safeB.happyC.warmD.friendly
小题20:
A.confusedB.disappointedC.moved D.frightened
题型:填空题

物质存放在烧杯中一段时间后,质量变大且变质的是

①浓盐酸 ②浓硫酸 ③烧碱 ④食盐 ⑤生石灰 ⑥稀硫酸

A.①⑥

B.②③⑤

C.③⑤

D.②③④

题型:填空题

合成渣洗

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