今有一混合物的水溶液,只可能含有以下离子中的若干种:K+.NH4+.Cl-.Mg

题型:选择题

问题:

今有一混合物的水溶液,只可能含有以下离子中的若干种:K+.NH4+.Cl-.Mg2+.Ba2+.CO32-

SO42-,现取三份100mL溶液进行如下实验:

(1)第一份加入AgNO3溶液有沉淀产生

(2)第二份加足量NaOH溶液加热后,收集到气体0.04mol

(3)第三份加足量BaCl2溶液后,得干燥沉淀6.27g,经足量盐酸洗涤。干燥后,沉淀质量为2.33g。

根据上述实验,以下推测正确的是[ ]

A.Cl-一定存在

B.100mL溶液中含0.01mol CO32-

C.K+一定存在

D.Ba2+一定不存在,Mg2+可能存在

考点:离子的检验
题型:选择题
阅读下面短文,从短文后所给各题的四个选项A.B.C.D中,选出可以填入空白处的最佳选项。
In the clinic, I asked if Michael could be retested, so the specialist tested him again. To my 21  , it was the same score.
Later that evening, I _22  _ told Frank what I had learned that day. After talking it over, we agree that we knew our _23_  much better than an IQ test. We 24   that Michael’s score must have been a _25  and we should treat him __26___ as usual.
We moved to Indiana in 1962, and Michael studied at Concordia High School in the same year. He got 27 grades in the school, especially 28 biology and chemistry, which was a great comfort.
Michael _29_ Indiana University in 1965 as a pre-medical student, soon afterwards, his teachers permitted him to take more courses than _30_ . In 1968, he was accepted by the School of Medicine, Yale University.
On graduation day in 1972, Frank and I 31  the ceremony at Yale. After the ceremony, we told Michael about the _  32_ IQ score he got when he was six. Since that day, Michael sometimes would look at us and say _33  , “My dear mom and dad never told me that I couldn’t be a doctor, not until after I graduated from medical school!” It is his special way of thanking us for the _34 _ we had in him.
Interestingly, Michael then _35 _ another IQ test. We went to the same clinic where he had _36 _  the test eighteen years before. This time Michael scored 126, an increase of 36 points. A result like that was supposed to be _37 _ .
Children often do as _38 _ as what adults, particularly parents and teachers, _39_  of them. That is, tell a child he is “ _40_”, and he may play the role of a foolish child.
小题1:
A.joyB.surpriseC.dislikeD.disappointment
小题2:
A.tearfullyB.fearfullyC.cheerfullyD.hopefully
小题3:
A.studentB.sonC.friendD.doctor
小题4:
A.arguedB.realizedC.decidedD.understood
小题5:
A.jokeB.mistakeC.warningD.wonder.
小题6:
A.speciallyB.strictlyC.naturallyD.carefully
小题7:
A.poorB.goodC.averageD.standard
小题8:
A.in B.aboutC.ofD.for
小题9:
A.visitedB.choseC.passedD.entered
小题10:
A.allowedB.describedC.requiredD.offered
小题11:
A.missedB.heldC.delayedD.attended
小题12:
A.highB.sameC.lowD.different
小题13:
A.curiouslyB.eagerlyC.calmlyD.jokingly
小题14:
A.faithB.interestC.prideD.delight
小题15:
A.looked forB.asked forC.waited forD.prepared for
小题16:
A.receivedB.acceptedC.organizedD.discussed
小题17:
A.imperfectB.impossibleC.uncertainD.unsatisfactory
小题18:
A.honestlyB.muchC.well D.bravely
小题19:
A.hear B.learnC.expectD.speak
小题20:
A.wiseB.rudeC.shyD.stupid
题型:选择题

某企业拟投资—建设项目,有关资料如下:

(1) 建设期为2年,运营期为8年,项目建设投资3100万元,预计90%形成固定资产,10%形成其他资产;

(2) 固定资产折旧年限为10年,按平均年限折旧法计算折旧,残值率为5%,在运营期末回收固定资产余值,其他资产按8年平均摊销;

(3) 建设投资贷款年利率为10%(按季计息),建设投资贷款在运营期前6年按照等额本金法偿还;流动资金贷款每年付息,流动资金贷款年利率为4%,流动资金在计算期末回收;

(4) 年营业税金及附加按营业收入的6%计取,所得税率为33%,行业基准投资收益率为12%;

(5) 建设项目发生的资金投入、收益及成本情况见表3-1。

[问题]

计算各年固定资产折旧费及调整所得税。

题型:选择题

某计数式频率计,测频率时闸门时间为1s,测周期时倍乘最大为×10000,晶振最高频率为10MHz,求中界频率。

题型:选择题

我国目前在卖出和买入证券时,均有零数委托。( )

题型:选择题

基金估值的频率是由基金的组织形式、投资对象的特点等因素决定的,并在相关的发行法律文件中明确。( )

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