设常数a∈R,若(x2+ax)5的二项展开式中x7项的系数为-10,则a=___

题型:填空题

问题:

设常数a∈R,若(x2+
a
x
)
5
的二项展开式中x7项的系数为-10,则a=______.
考点:二项式定理与性质
题型:填空题
“But I feel good doing this!” the little boy’s voice rang in my ears when I entered the mall. He stood raising        for cancer research. In the cold wind, he pulled his hat down over his ears. He warmed one hand in his pocket and held a list with the other hand. I noticed him greeting the people passing by          gloves on his hands.
I checked my purse but I didn’t find any change. I was         ready to give money because I wished cancer could be cured (治愈) one day.
“I’ll bring you some money when I returned” I         the little boy.
“Thank you!” he smiled and he seemed almost        in the cold air. I suggested he come inside the mall, but he said, “The guard there said          is allowed to raise money for charities (慈善) in the mall. But I feel good doing this here. It’s OK.”
I did my shopping and         about buying something for him. Finally, I bought a pair of gloves, brown ones. The cashier (收银员) felt curious when I        the boy’s words “But I feel good doing this!”
The boy still stood where he had been. I offered some money to him and          in the list that he handed to me. Then he told me that his best friend George had leukemia (白血病). He did this in order to help him out of       .
With tears full of my eyes, I put the gloves that I bought for him into his hands.
“Will the cancer research give you something to thank you for doing this?”
“Oh yes!” the boy said and his eyes          up with joy, “They sure do! Now I can stand here much          than I expected!”
“What do you receive then?” I asked. He answered with a smile, “I get another new, empty list.”
小题1:
A.cardsB.moneyC.bottlesD.information
小题2:
A.withoutB.exceptC.intoD.from
小题3:
A.neverB.seldomC.sometimesD.always
小题4:
A.cheatedB.refusedC.promisedD.praised
小题5:
A.relaxedB.boredC.frozenD.pleased
小题6:
A.everyoneB.anyoneC.someoneD.no one
小题7:
A.thoughtB.worriedC.talkedD.cared
小题8:
A.introducedB.repeatedC.heardD.kept
小题9:
A.calledB.filledC.gaveD.got
小题10:
A.sightB.workC.troubleD.breath
小题11:
A.litB.cameC.caughtD.took
小题12:
A.lowerB.lessC.earlierD.longer
题型:填空题

血瘤是______的功能异常,______所致。

题型:填空题

供角膜创伤或手术滴眼剂的配制和灌封生产环境的空气洁净要求()

A.洁净度级别为100级

B.洁净度级别为1000级

C.洁净度级别为10000级

D.洁净度级别为100000级

E.洁净度级别为300000级

题型:填空题

关于新生儿窒息,下列说法哪项是错误的()

A.生后无窒息,数分钟后出现呼吸抑制者

B.可造成肾功能不全

C.可导致低氧血症

D.无二氧化碳潴留

E.是指生后无呼吸者

题型:填空题

人类寄希望于利用干细胞(人体中具有分裂、分化能力的细胞)的分离和体外培养,体外培育出组织器官,并最终通过组织或器官移植实现对临床疾病的治疗。能否用神经细胞代替干细胞()

A.不能,因为神经细胞与干细胞所含有的遗传物质不同

B.不能,因为神经细胞是高度分化的细胞,没有分裂能力

C.能,因为神经细胞虽然是分化的细胞,但在一定条件下也可脱分化,实现细胞全能性

D.能,因为神经细胞与干细胞具有完全相同的遗传物质

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