相关试题
【判断题】
硫化氢系统分析中第一组阳离子的氯化物不溶于水。
【判断题】
两酸两碱阳离子系统分析第一组的离子的沉淀是白色与黄色沉淀共存。
【判断题】
固相微萃取装置是由手柄和萃取头或纤维头两部分构成的。
【判断题】
固相微萃取技术适用于挥发性物质，而不适用于非挥发性物质的萃取分离。
【判断题】
液相微萃取常采用顶空方式采集和萃取液体或固体样品中有机挥发物。
【判断题】
液相微萃取技术应用顶空方式采样时，萃取剂与被采取试样不直接接触的一种萃取方法。
【判断题】
液相微萃取技术应用顶空方式采样时，可以完全消除样品基体的干扰。
【判断题】
液相微萃取技术的萃取装置可用10uＬ微量注射器进行。
【判断题】
液相微萃取技术采用微量注射器作为萃取装置时，萃取后不可直接进色谱仪分析。
【判断题】
液相微萃取技术应用顶空方式采样时，萃取效率与样品上方顶空部分的体积无关。
【判断题】
火焰原子吸收光谱仪的燃烧器高度应调节至测量光束通过火焰的第一反应区。
【判断题】
在原子吸收光谱法分析中，火焰中的难熔氧化物或碳粒等固体颗粒物的存在，将产生背景干扰。
【判断题】
在原子吸收光谱法测定钾时，常加入1%的CsC1,以抑制待测元素电离干扰的影响。
【判断题】
在原子吸收光谱法中，消除背景干扰的影响较理想的方法是采用塞曼效应校正背景。
【判断题】
在原子吸收光谱法中，石墨炉原子化法一般比火焰原子化法的精密度高。
【判断题】
对于谱线简单，无干扰的元素，一般采用较宽的狭缝宽度，以减少灯电流和光电倍增管的高压来提高信噪比。
【判断题】
原子吸收分光光度法的定量依据是比耳定律。
【判断题】
原子吸收光谱仪开启后，选择好操作条件后即可进样测定。
【判断题】
在使用火焰原子化器的原子吸收光谱仪时，当测试完毕后，即可熄火关机。
【判断题】
对长期不用的原子吸收光谱仪中的元素灯，应定期在工作电流下点燃，以延长灯的寿命。
【判断题】
出厂产品用的计量器具在计量检定有效期内，不必进行自校，一直可以使用。
【判断题】
出厂产品用的计量器具在计量检定有效期内，进行检修后仍可继续有效使用。
【判断题】
中间控制分析的计量器具是不需要进行计量检定的。
【判断题】
国家级实验室的检测报告必须有检验人、复核人、审批人签字，并盖上国家级实验室印章有效。
【判断题】
国家检测中心的检测报告有二级人员签字，并盖上国家级实验室印章有效。
【判断题】
电子天平的主要技术参数有量程、重复性、线性误差、操作温度范围、校准方式和秤盘尺寸等。
【判断题】
在电子天平的校验项目中，天平重复性的检定和天平偏载的检査是必检项目。
【判断题】
波长范围、波长准确性、光谱带宽和杂光是可见光分光光度计的重要指标。
【判断题】
稳定度、波长准确度、波长重复性和透射比准确性是可见分光光度计波长准确度的校验指标。
【判断题】
波长范围、波长准确性、光谱带宽和杂光不是紫外光分光光度计的重要指标。
【单选题】
64T64R AAU支持的NR广播波束的垂直3dB波宽，最大可以支持多少？___
A. 6°
B. 36°
C. 12°
D. 25°
【单选题】
NR的DC双连接只存在于核心网为EPC的架构中___
【单选题】
NR小区存在越区覆盖的首要解决思路是降低小区发射功率。___
【单选题】
NSA网络中，在以下哪条消息之后标示着UE完全接入5G网络？___
A. RPC Connection Reconfi guration之后
B. UE完成在SgNodeB上的RA之后
C. SgNodeB Addition Request之后
D. SgNodeB Addition Complete之后
【单选题】
5R RAN2.1中，U2020可以同时支持BTS5900和3900的网元管理。___
【单选题】
下面说法正确的是___。
A. 正数有意义，负数没有意义
B. 正数和负数可以用来表示具有相反意义的量
C. 温度计上显示0 ℃，表示没有温度
D. 零上3 ℃低于零下5 ℃
推荐试题
【单选题】
I appreciate ___ to your home.
A. to be invited
B. to have invited
C. having invited
D. being invited
【单选题】
The socks were too small and it was only by ___ them that he managed to get them on.
A. spreading
B. extending
C. lengthening
D. stretching
【单选题】
The trade imbalance is likely to rise again in 2020. ___ a new set of policy actions will be required soon.
A.
B. ecause B. For
C. Hence
D. Therefore
【单选题】
A healthy life is frequently thought to be ___ with the open countryside and homegrown food.
A. associated
B. bound
C. involved
D. tied
【单选题】
My hands and feet were ___ with cold as I waited for the bus.
A. cliff
B. still
C. stiff
D. stick
【单选题】
The Foreign Minister made an excellent ___ on the current international situation.
A. committee
B. command
C. comment
D. commission
【单选题】
Over a third of the population was estimated to have no ___ to the health service.
A. assessment
B. assignment
C. exception
D. access
【单选题】
My father seemed to be in no ___ to look at my school report.
A. mood
B. emotion
C. attitude
D. feeling
【单选题】
He saw the publication of this book as an embarrassing invasion of his ___.
A. secret
B. privacy
C. private
D. piracy
【单选题】
I think I would have died of ___.
A. embarrass
B. embarrassing
C. embarrassed
D. embarrassment
【单选题】
He had an ___ at a restaurant in Greek Street at eight.
A. engagement
B. engage
C. contract
D. promise
【单选题】
These companies often encounter many ___ impediments to investment.
A. invisible
B. edible
C. feasible
D. capable
【单选题】
30 percent of reptiles, birds, and fish are currently ___ with extinction.
A. treated
B. threatened
C. endangered
D. threatening
【单选题】
They have a stronger ___ of the importance of economic incentives.
A. appreciation
B. learning
C. concept
D. idea
【单选题】
I believe I am capable of ___ the political consequences accurately.
A. guessing
B. evaluating
C. calculating
D. computing
【单选题】
When he opened the door, he used too much force and ___ the key.
A. trailed
B. varied
C. wicked
D. twisted
【单选题】
I’m very sorry to have ___ you with so many questions on such an occasion.
A. offended
B. impressive
C. bothered
D. interfered
【单选题】
It is sometimes difficult for young people from the countryside to ___ well to life in the big city.
A. suit
B. adapt
C. regulate
D. coordination
【单选题】
Our guide gave us a detailed ___of this painting but we still do not understand.
A. authority
B. interpretation
C. instruction
D. institution
【单选题】
If you want to ___ the wood, cut it with the grain, not against it.
A. break
B. burn
C. split
D. divide
【单选题】
They have a stronger ___ of the importance of economic incentives.
A. appreciation
B. learning
C. conception
D. idea
【单选题】
I believe I am capable of ___ the political consequences accurately.
A. guessing
B. betting
C. calculating
D. computing
【单选题】
30 percent of reptiles, birds, and fish are currently ___ with extinction.
A. treated
B. threatened
C. danger
D. threatening
【单选题】
Workers should occasionally walk around, ___ and avoid prolonged periods at the desk.
A. pull
B. lengthen
C. strain
D. stretch
【单选题】
These companies often encounter many ___ impediments to investment.
A. invisible
B. edible
C. feasible
D. capable
【单选题】
Running a kitchen ___a great deal of discipline and speed.
A. including
B. involving
C. involves
D. composes
【单选题】
He had an ___ at a restaurant in Greek Street at eight.
A. engagement
B. engage
C. contract
D. promise
【单选题】
I think I would have died of ___.
A. embarrass
B. embarrassing
C. embarrassed
D. embarrassment
【单选题】
He saw the publication of this book as an embarrassing invasion of his ___.
A. secret
B. privacy
C. private
D. piracy
【单选题】
The trade imbalance is likely to rise again in 2020. ___ a new set of policy actions will be required soon.
A.
B. ecause B. Nevertheless
C. Hence
D. Therefore
【单选题】
Stratford police refuse to comment ___ whether anyone has been arrested.
A. about
B. on
C. at
D. with
【单选题】
The world will be different, and we will have to be prepared to ___ to the change.
A. adopt
B. adapt
C. accustom
D. adept
【单选题】
The company has launched a campaign of television ___ and leaflets.
A. commercials
B. commences
C. commerce
D. commercialization
【单选题】
The general secretary may ___ the president at official ceremonies.
A. present
B. represent
C. representative
D. stand
【单选题】
He ___ her arms behind her back and clipped a pair of handcuffs on her wrists.
A. dragged
B. pulled
C. stretched
D. twisted
【单选题】
Suppose that when I come back in ten years’ time all these old houses ___ down.
A. will have been pulled
B. will have pulled
C. will be pulling
D. will be pulled
【单选题】
The picture exhibition bored me to death. I wish I ___ to it.
A. have not gone
B. did not go
C. had not gone
D. should not have gone
【单选题】
An investigation was made into the accident ___ fifty people were killed.
A. for that
B. where
C. when
D. in which
【单选题】
___ with the picture, Mary tore it to pieces.
A. Dissatisfying thoroughly
B. Being thoroughly dissatisfied
C. To dissatisfy thoroughly
D. To be thoroughly dissatisfied
