【单选题】
We have time and again___ that we will never be the first to use nuclear weapons.
A. declared
B. accused
C. announced
D. blamed
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相关试题
【单选题】
Since the matter was extremely ___, we dealt with it immediately.
A. tough
B. tense
C. urgent
D. rough
【单选题】
She was so ___ in her job that she didn’t hear anybody knocking at the door.
A. attracted
B. absorbed
C. drawn
D. concentrated
【单选题】
He is ___ about his chances of winning a gold medal in the Olympics next year.
A. outstanding
B. optional
C. optimistic
D. obvious
【单选题】
The president could not go to the meeting, so Mr. Smith___ him.
A. recorded
B. renewed
C. represented
D. recalled
【单选题】
He wrote an article criticizing the Greek poet and won ___and a scholarship.
A. faith
B. prestige
C. status
D. courage
【单选题】
Jane was hit on the head by the robber and was knocked___.
A. mindless
B. unaware
C. brainless
D. unconscious
【单选题】
It is our___policy that we will achieve unity through peaceful means.
A. consistent
B. continuous
C. considerate
D. continual
【单选题】
The author of the report is well___with the problems in the hospital because he has been working there for many years.
A. informed
B. acquainted
C. enlightened
D. acknowledged
【单选题】
The manager lost his ___ just because his secretary was ten minutes late.
A. mood
B. temper
C. mind
D. passion
【单选题】
Many Europeans___ the continent of Africa in the 19th century.
A. exploded
B. explored
C. exposed
D. expanded
【单选题】
If you hear such a rumor,___ it thoroughly.
A. seek
B. investigate
C. search
D. explore
【单选题】
The pressure ___causes Americans to be energetic, but it also puts them under a constant emotional strain.
A. to compete
B. competing
C. to be competed
D. having competed
【单选题】
Having decided to rent a flat, we ___ contacting all the accommodation agencies in the city.
A. set about
B. set on
C. set out
D. set up
【单选题】
The old couple decided to ___ a boy and a girl though they had three children of their own.
A. adapt
B. adjust
C. adept
D. adopt
【单选题】
Mike was being ___for violent tendencies.
A. contended
B. consulted
C. counselled
D. insulted
【单选题】
I will___ Mr. Walters on this point.
A. refer to
B. commit to
C. contribute to
D. defer to
【单选题】
What happens in the next few days is___to our success.
A. critical
B. critic
C. prior
D. valid
【单选题】
She won’t___that there is a problem.
A. confer
B. concern
C. acknowledge
D. contemplate
【单选题】
This offer is___ for travel before the end of April.
A. effective
B. ineffective
C. invalid
D. valid
【单选题】
___ to British universities depends on examination results.
A. Admittance
B. Entry
C. Admission
D.
E. ntrance
【单选题】
The database is only ___ by authorized managers.
A. proved
B. accessible
C. approved
D. access
【单选题】
This traditional ___ is of indigo blue.
A. clothes
B. diversity
C. costume
D. institution
【单选题】
These cigarettes are a ___ of the best tobaccos.
A. blend
B. band
C. mixture
D. mess
【单选题】
The tennis players need total ___ during play.
A. concentration
B. section
C. depression
D. energy
【单选题】
He ___ that he was innocent.
A. announced
B. declared
C. disclosed
D. admitted
【单选题】
Columbus discovered America but did not ___ the new continent.
A. seek
B. investigate
C. search
D. explore
【单选题】
The trees ___their foliage every year.
A. repeat
B. grow
C. refresh
D. renew
【单选题】
Make a list of the various ___.
A. options
B. choice
C. optional
D. samples
【单选题】
I am well aware that this is a ___ job.
A. rough
B. tough
C. wealthy
D. rogue
【单选题】
I found their kindness quite ___.
A. strong
B. overweening
C. keen
D. overwhelming
【单选题】
The captain wasn’t ___ on having him in the team.
A. eager
B. keen
C. overwhelmed
D. anxious
【单选题】
He was ___at the prospect of seeing them again.
A. thrilling
B. blessed
C. thrilled
D. emotional
【单选题】
They ___ against travelling at night in such a dangerous country.
A. consul
B. advocate
C. counsel
D. recommend
【单选题】
It is absolutely vital that food supplied should be ___.
A. sustained
B. enhanced
C. exhausted
D. maintained
【单选题】
He must have had an accident, or he ___ then.
A. would have been here
B. had to be here
C. should be here
D. would be here
【单选题】
It was essential that the application forms ___ back before the deadline (截止日期).
A. must be sent
B. would be sent
C. be sent
D. were sent
【单选题】
We ___ our breakfast when an old man came to the door.
A. just have had
B. have just had
C. just had
D. had just had
【单选题】
The bridge was named ___ the hero who gave his life for the cause of the people.
A. after
B. with
C. by
D. from
【单选题】
It wasn’t such a good dinner ___ she had promised us.
A. that
B. which
C. as
D. what
【单选题】
The road now ___two kilometers beyond the river.
A. develops
B. extends
C. expands
D. widens
推荐试题
【单选题】
[2]下列数据记录有错误的是___。
A. 分析天平0.2800g
B. 移液管25.00ml
C. 滴定管25.00ml
D. 量筒25.00ml
【单选题】
[3]欲测某水泥熟料中的SO2含量，由四人分别进行测定。试样称取量皆为2.2g，四人获得四份报告如下：0.020852、0.02085、0.0208、2.1%，其中合理的报告是___。
A. 0.020802
B. 0.02085
C. 0.0208
D. 2.1%
【单选题】
[2]洌定SO2的质量分数，得到下列数据___：28.62，28.59，28.51，28.52，28.61。则置信度为95%时平均值的置信区间为。(已知置信度为95%，n=5，t=2.776)
A. 28.57±0.12
B. 28.57±0.13
C. 28.56±0.13
D. 28.57±0.06
【单选题】
[2]要改变分析天平的灵敏度可调节___。
A. 吊耳
B. 平衡螺钉
C. 拔杆
D. 感量螺钉
【单选题】
[2]衡量样本平均值的离散程庋时，应采用___。
A. 标准偏差
B. 相对标准偏差
C. 极差
D. 平均值的标准偏差
【单选题】
[2]当置信度为0.95时，测得Al2O3的μ置信区间为(35.21±0.10)%，其意义是___。
A. 在所测定的数据中有95%在此区间内
B. 若再进行测定，将有95%的数据落人此区间内
C. 一总体平均值μ落入此区间的概率为0.95
D. 在此区间内包含μ值的概率为0.95
【单选题】
[2]由计算器计算9.25×0.21334÷(1.200×100)的结果为0.0164449，按有效数字规则将结果修约为___。
A. 0.016445
B. 0.01645
C. 0.01644
D. 0.0164
【单选题】
[2] 16℃时1mL水的质量为0.99780g，在此温度下校正l0ml单标线移液管，称得其放出的纯水质量为10.04g，此移液管在20℃时的校正值是___。
A. -0.02 mL
B. +0.02 mL
C. -0.06 mL
D. +0.06 mL
【判断题】
[2]容量瓶与移液管不配套会引起偶然误差
【判断题】
[2]在没有系统误差的前提条件下，总体平均值就是真实值
【判断题】
[3]准确度表示分析结果与真实值接近的程度。它们之间的差别越大，则准确度越高
【判断题】
[2]相对误差会随着测量值的增大而减小，所以消耗标准溶液的量多误差小
【判断题】
[1]误差是指测定值与真实值之间的差值，误差相等时说明测定结果的准确度相等
【判断题】
[2]0.650×100=0.630×(100+V)中求出的V有3位有效数字
【判断题】
[2]在分析数据中，所有的“0”都是有效数字
【判断题】
[3]在3～10次的分析测定中，离群值的取舍常用4d法检验；显著性差异的检验方法在分析工作中常用的是t检验法和F检验法
【判断题】
[3]做空白试验，可以减少滴定分析中的偶然误差
【判断题】
[3]进行滴定操作前，要将滴定管尖处的液滴靠进锥形瓶中
【判断题】
[2]12℃时0.1mol／L某标准溶液的温度补正值为+1.3，滴定用去26.35mL，校正为20℃时的体积是26.32mL
【判断题】
[2]通常移液管的标称容积与实际容积之间存在误差，需用一个系数R予以校正，简单地可表示为V=RW
【判断题】
[3]半微量分析的试样取用量一般为0.001～0.0lg
【判断题】
[2]11.48g换算为毫克的正确写法是11480mg
【判断题】
[2]偏差表示测定结果偏离真实值的程度
【判断题】
[3]增加测定次教可以提高实验的准确度
【判断题】
[3]有效数字当中不包括最后一位可疑数字
【判断题】
[2]使用滴定管时，每次滴定应从“0”分度开始，是为了减少偶然误差
【判断题】
[2]做的平行次数越多，结果的相对误差越小
【判断题】
[2]错pH=3.05的有效数字是三位
【判断题】
[1]分析纯的NaCl试剂，如不做任何处理，用来标定AgNO3溶液的浓度，结果会偏高
【判断题】
[2]测定结果精密度好，不一定准确度高
【判断题】
[2]平均偏差常用来表示一组测量数据的分散程度
【判断题】
[2]Q检验法适用于测定次数为3≤n≤10时的测试
【判断题】
[2]天平使用过程中要避免震动、潮湿、阳光直射及腐蚀性气体
【判断题】
[1]滴定管、移液管和容星瓶校准的方法有称量法和相对校准法
【判断题】
[2]误差是指测定值与真实值之间的差，误差的大小说明分析结果准确度的高低
【判断题】
[1]测定石灰中铁的质量分数(%)，已知4次测定结果为：1.59，1.53，1.54和1.83。利用Q检验法判断出第四个结果应弃去。已知Q0.90,4=0.76
【判断题】
[3]允许误差也称为公差，是指进行多次测定所得到的一系列数据中最大值与最小值的允许界限（也即极差）
【判断题】
[1]对pH=3.05的有效数字是两位
