把300mL有BaCl2和AlCl3的混合溶液分成3等份,取一份加入含a mol

题型:选择题

问题:

把300mL 有BaCl2和AlCl3的混合溶液分成3等份,取一份加入含a mol硫酸钠的溶液,恰好使钡离子完全沉淀;另取一份加入等体积4 mol/L氢氧化钠溶液,恰好使产生的沉淀溶解。则该混合溶液中氯离子浓度为[ ]

A.20a+3b     

B.20a/3 +b      

C.2a+3b      

D.10a+2b 

考点:物质的量浓度
题型:选择题
I will never forget the year I was about twelve years old.My mother told us that we would not be   26  Christmas gifts because there was not enough money.I felt sad and thought, "What would I say when the other kids asked what I’d 27 ?" Just when I started to  28  that there would not be a Christmas that year, three women  29  at our house with gifts for all of us.For me they brought a doll.I felt such a sense of 30  that I would no longer have to be embarrassed when I returned to school.I wasn’t   31 .Somebody had thought  32  of me to bring me a gift.
Years later, when I stood in the kitchen of my new house, thinking how I wanted to make my  33 Christmas there special and memorable, I  34  remembered the women’s visit.I decided that I wanted to create that same feeling of  35  for as many children as I could possibly reach.
So I   36  a plan and gathered forty people from my company to help.We gathered about 125 orphans (孤儿) at the Christmas party.For every child, we wrapped colorful packages filled with toys, clothes, and school supplies,   37  with a child’s name.We wanted all of them to know they were  38.Before I called out their names and handed them their gifts, I   39  them that they couldn’t open their presents   40  every child had come forward.Finally the   41  they had been waiting for came as I called out, "One, two, three.Open your presents!" As the children opened their packages, their faces beamed and their bright smiles  42  up the room.The   43  in the room was obvious, and   44  wasn’t just about toys.It was a feeling — the feeling I knew   45 that Christmas so long ago when the women came to visit.I wasn’t forgotten.Somebody thought of me.I matter.
小题1:
A.sending B.receivingC.making D.exchanging
小题2:
A.found B.preparedC.gotD.expected
小题3:
A.doubtB.hopeC.suggest D.accept
小题4:
A.broke in B.settled down C.turned upD.showed off
小题5:
A.relief B.lossC.achievementD.justice
小题6:
A.blamedB.lovedC.forgottenD.affected
小题7:
A.highly B.little C.poorlyD.enough
小题8:
A.presentB.firstC.recent D.previous
小题9:
A.hardly B.instantlyC.regularly D.occasionally
小题10:
A.strength B.independenceC.importance D.safety
小题11:
A.kept up withB.caught up withC.came up withD.put up with
小题12:
A.none B.fewC.some D.each
小题13:
A.fine B.special C.helpfulD.normal
小题14:
A.remindedB.guaranteed C.convinced D.promised
小题15:
A.after B.until C.when D.since
小题16:
A.chance B.giftC.moment D.reward
小题17:
A.litB.tookC.burned D.cheered
小题18:
A.atmosphereB.sympathy C.calmnessD.joy
小题19:
A.it B.suchC.somethingD.everybody
小题20:
A.byB.tillC.forD.from
题型:选择题

下述哪种是良性肿瘤()。

A.淋巴细胞瘤

B.黑色素瘤

C.尤文肉瘤

D.骨髓瘤

E.间皮细胞瘤

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在数据管理技术发展阶段中,文件系统阶段与数据库系统阶段的主要区别之一是数据库系统

A.数据可共享

B.数据可长期保存

C.采用一定的数据模型组织数据

D.有专门的软件对数据进行管理

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人员测评标准的类型,依据测评手段,可以将测评标准发为()和定性标准。

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颅骨骨折时出现"熊猫眼"征,主要见于()

A.前颅窝骨折

B.中颅窝骨折

C.后颅窝骨折

D.凹陷性骨折

E.线形骨折

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