【判断题】
62.在络合滴定中,溶液的酸度对测量将产生影响。 ( )
A. 对
B. 错
查看试卷,进入试卷练习
微信扫一扫,开始刷题
答案
A
解析
暂无解析
相关试题
【判断题】
63.过滤水样的化学耗氧量反映了水中可溶性有机物的含量。 ( )
A. 对
B. 错
【判断题】
64.铬黑T的游离色为蓝色。 ( )
A. 对
B. 错
【判断题】
65.硼砂缓冲溶液不宜用玻璃瓶贮存。 ( )
A. 对
B. 错
【判断题】
66.测定硫酸根时,水样中的有机物将有利于硫酸钡沉淀完全。 ( )
A. 对
B. 错
【判断题】
67.磷钼蓝比色法适用于磷酸根为2~50mg/L的水样。( )
A. 对
B. 错
【判断题】
68.测定水中Cl-浓度,可采用银量法或pCl电极法。 ( )
A. 对
B. 错
【判断题】
69.每个方法的检出限和灵敏度是表示该方法对待测物测定的最小浓度。 ( )
A. 对
B. 错
【判断题】
70.随着溶液浓度的提高,对某一波长范围的光吸收越强。 ( )
A. 对
B. 错
【判断题】
71.非单色光和溶液中的副反应可引起比耳定律移离。 ( )
A. 对
B. 错
【判断题】
72.分光光度法比目视比色法准确度高,选择性好,是因为它采用的入射光的单色性好。 ( )
A. 对
B. 错
【判断题】
73.测定水样碱度时,若水样中含有较多的游离氯,可加硝酸银以消除干扰。 ( )
A. 对
B. 错
【判断题】
74.重量法测硫酸盐含量时,生成的沉淀的灼烧温度应高于900℃。 ( )
A. 对
B. 错
【判断题】
75.用邻菲罗啉分光光度法测铁时,应先加入邻菲罗啉,后调溶液的pH值。 ( )
A. 对
B. 错
【判断题】
76.摩尔吸光系数的大小与入射光的波长有关。 ( )
A. 对
B. 错
【判断题】
77.水样中酚酞碱度与全碱度相等时,说明只有HCO3-存在。( )
A. 对
B. 错
【判断题】
78.摩尔吸光系数越大,表明该有色物质对此小波长光的吸收能力越强。 ( )
A. 对
B. 错
【判断题】
79.弱电解质在溶液中不完全电离,所以其溶液不导电。 ( )
A. 对
B. 错
【判断题】
80.相同的比色皿的透光率之差应小于0.5%。 ( )
A. 对
B. 错
【判断题】
81.pH计中起盐桥作用的是甘汞参比电极。 ( )
A. 对
B. 错
【判断题】
82.用混凝沉淀法处理废水时,应考虑混凝剂的选择和最佳投药量。 ( )
A. 对
B. 错
【判断题】
83.在滴定过程中,指示剂发生颜色变化的转变点叫反应的理论终点。 ( )
A. 对
B. 错
【判断题】
84.EDTA滴定钙离子时,应在强酸溶液中进行。 ( )
A. 对
B. 错
【判断题】
85.在进行硬度测定时,对碳酸盐硬度较高的水样,在加入缓冲溶液前应先稀释。 ( )
A. 对
B. 错
【判断题】
86.磷钼钒的黄色较稳定,在室温下不受其他因素的影响。 ( )
A. 对
B. 错
【判断题】
87.pNa5的标准溶液只能用来复核钠度计,不能作复定位液使用。 ( )
A. 对
B. 错
【判断题】
88.重铬酸钾快速法测水中COD时,氯离子对测量结果无影响。 ( )
A. 对
B. 错
【判断题】
89.系统误差、过失误差、随机误差都是遵从正态分布的。 ( )
A. 对
B. 错
【判断题】
90.测定钙硬度时,需控制溶液的pH值为10。 ( )
A. 对
B. 错
【判断题】
91.定期排污通常是在锅炉热负荷高时进行。 ( )
A. 对
B. 错
【判断题】
92.离子交换树脂只是用来去除水中的硬度。 ( )
A. 对
B. 错
【判断题】
93.电力系统稳定运行时,发电机发出总功率与用户消耗总功率相等。 ( )
A. 对
B. 错
【判断题】
94.当强碱溅到眼睛时,应立即送医务所急救。 ( )
A. 对
B. 错
【判断题】
95.任何人都可以搬运和使用浓酸或浓碱性药品。 ( )
A. 对
B. 错
【判断题】
96.联氨在搬运和使用时,必须放在密封的容器内,不准与人体直接接触。 ( )
A. 对
B. 错
【判断题】
97.主蒸汽管道保温后,可以防止热传递过程的发生。 ( )
A. 对
B. 错
【判断题】
98.随机误差和系统误差是决定实验结果准确程度的因素。 ( )
A. 对
B. 错
【填空题】
反义词。 深()
【单选题】
持有PMP证书的项目管理工作者,在管理项目的过程中,必须遵守以下哪个文件中的规定?( )
A. PMI的《项目管理知识体系指南》( PMBOK指南)
B. PMI的《项目集管理标准
C. PMI的《组织级项目管理成熟度模型》(OPM3)
D. PMI的《道德与专业行为规范》
【单选题】
某公司正在召开一个项目选择会议,要确定拟在后三年上马的一系列项目。参会者对各候选项目与公司战略目标的关系以及各项目的重要性展开了热烈讨论。会议将形成一份候选项目的优先级排序清单。参会者正在做:( )
A. 项目组合管理
B. 组织级项目管理
C. 项目集管理
D. 项目资源管理
【单选题】
在实施项目的过程中,应该认真考虑项目产品的维护与持续运营问题这种护维与持续运营应该:( )
A. 是项目收尾阶段的一项重安活动
B. 是项目生命周期中的一个阶段,因为生命周期成本中包括维护和持续运营成本
C. 不是项目的一部分
D. 是一个独立的项目
推荐试题
【单选题】
Poor Laura! I feel so sorry for her. When she fell, she hurt her arm and, ___, broke her glasses.
A. in advance
B. in addition
C. over time
D. on the other hand
【单选题】
Showing some sense of humor can be a(n) ___ way to deal with some stressful situations.
A. genuine
B. available
C. effective
D. favorite
【单选题】
It will be worth the efforts even if you fail; the rewards you ___ will be great.
A. reap
B. boast
C. assure
D. cultivate
【单选题】
He suggested transporting the supplies by air. But it is absolutely ___, for it will cost too much.
A. unusual
B. uncertain
C. impractical
D. impressive
【单选题】
The newspaper didn’t mention the ___ of the damage caused by the fire.
A. range
B. level
C. extent
D. quantity
【单选题】
Do you ___ her novels as serious literature or as mere entertainment?
A. classify
B. notify
C. simplify
D. justify
【单选题】
He doesn’t ___ of buying a house this year because the bank has refused to lend him any money.
A. afford
B. make the most
C. run out
D. stand a chance
【单选题】
If you don’t ___ cooking today, we can go out to eat at the new restaurant.
A. would like
B. go on with
C. feel like
D. figure out、
【单选题】
Bullying (恃强欺弱) can ___ a climate of fear and anxiety in school, and prevent students from focusing on their schoolwork.
A. keep back
B. give rise to
C. feel like
D. make use of
【单选题】
Science can now ___ many things which were thought to be mysterious by ancient people.
A. care for
B. lay out
C. account for
D. set up
【单选题】
The school has ___ many after-class activity groups for the pupils to make their spare time more colorful.
A. set up
B. set off
C. set out
D. set down
【单选题】
When he was a small kid, he ___ from his peers because he could read fast and remember whatever he rea D.
A. showed off
B. worked out
C. stood out
D. straightened up
【单选题】
The fall in the number of deaths from heart disease is generally ___ improvements in diet.
A. put up with
B. attributed to
C. added to
D. replaced with
【单选题】
We can be partners for now, but ultimately you have to ___ to develop a new software for our project.
A. keep up
B. fire off
C. make sense
D. take the lead
【单选题】
Emotional Intelligence (情商) could be of practical use in many ___ such as how companies decide which job applicant to hire, how parents should raise their children, how schools should teach the students, and so on.
A. aspects
B. disciplines
C. structures
D. opportunities
【单选题】
The teacher should praise students for their correct answers and also suggest ___ possibilities.
A. unlimited
B. unique
C. alternative
D. essential
【单选题】
In some classrooms, desks are arranged in a U-shape, so the teacher can ___ easily with the students.
A. interrupt
B. interact
C. interpret
D. interview
【单选题】
Computer technology ___ individuals to educate themselves and adapt to a constantly changing job market.
A. lets
B. makes
C. enables
D. provides
【单选题】
Our hope for an enjoyable dinner was instantly ___ when the waiter dropped a salad plate on my hea D.
A. spoiled
B. restricted
C. exploded
D. vanished
【单选题】
___ the world has ever seen has occurred in the information and communications technologies.
A. Great a change
B. The great change
C. A greatest change
D. The greatest change
【单选题】
___ so many people around, it wasn’t convenient to have a long talk with him.
A. As
B. When
C. With
D. Since
【单选题】
Alice used to be terribly shy, but working abroad for a year has completely ___ her.
A. solved
B. transformed
C. characterized
D. regulated
【单选题】
Chinese Mandarin (普通话) is ___ for foreigners to learn because the changes in the tone will totally change the meaning of words.
A. difficult
B. accessible
C. competitive
D. easy
【单选题】
Take action on those things that will have the biggest ___ impact on your life with the least amount of effort.
A. portable
B. positive
C. sophisticated
D. moderate
【单选题】
The adoption of this measure will greatly reduce the ___ of greenhouse gas emissions (排放物), which may help slow global warming.
A. loan
B. decline
C. release
D. response
【单选题】
I think I have a healthy lifestyle. I eat a lot of fruit and vegetables, and I’m a ___ drinker.
A. moderate
B. heavy
C. gradual
D. delicate
【单选题】
In a way the human race needs to improve its mental and physical qualities if it is to deal with the more and more ___ world and meet new challenges.
A. typical
B. complex
C. rational
D. orderly
【单选题】
If a person simply does not care about this activity, it’s ___ impossible to get him to participate.
A. barely
B. seldom
C. hardly
D. practically
【单选题】
Sometimes, even when the mind ___ functioning, the body keeps on working normally.
A. ceases
B. arouses
C. regulates
D. specializes
【单选题】
Jeffery expressed his ___ about the health and fitness of his co-workers, but they said they didn’t want to “waste time” on an exercise bike or jogging.
A. agony
B. concern
C. addiction
D. feedback
【单选题】
Such chemicals are indeed negatively ___ those humans to whom they are expose D.
A. risking
B. detecting
C. impacting
D. overwhelming
【单选题】
We regret for selling you the faulty product, and our company has agreed to ___ you by $500.
A. match
B. reverse
C. reward
D. compensate
【单选题】
This lecture taught me how to manage my time better to include my online studies in my busy ___.
A. schedule
B. outline
C. structure
D. responsibility
【单选题】
Generally speaking, an Irish person will not accept an offer straight away; he will ___ once or twice first before accepting it.
A. receive
B. decline
C. summarize
D. polish
【单选题】
There is every possibility that many species (物种) of animals will die out because of their disappearing food ___.
A. mode
B. source
C. pattern
D. foundation
【单选题】
As a college student, you should enjoy learning and get yourself ___ in those things that interest you.
A. concerned
B. devoted
C. involved
D. pursued
【单选题】
The name of Hitler (希特勒) has always been associated with war and ___ killing in the minds of those people who lived through World War Two.
A. imaginary
B. multiple
C. indispensable
D. massive
【单选题】
He works hard every day to make more money, but he ___ his health, time with his family, and the hobbies he once love D.
A. neglects
B. reminds
C. ceases
D. Declines
【单选题】
I asked a passenger sitting beside me if our train was the Westlake Express train, and he said he ___ of it.
A. not even heard
B. had not even heard
C. even not heard
D. ever had not heard
【单选题】
Whatever you say in the paper has to ___ your own thinking; hence simply repeating the professor’s opinions or whatever is in the readings will not get you very far.
A. ignore
B. arouse
C. reflect
D. release