相关试题
【单选题】
在转移型等离子弧中,接电源正极的是___
【单选题】
二氧化碳由液态变为气态的沸点为___℃
【单选题】
堆焊速度过小,堆焊层加厚,焊缝（焊道）___。
【单选题】
灭火的基本原则之一是"___重于救火"。
【单选题】
焊机的接地回路应尽量___,软线绝缘应良好
【单选题】
防止职业危害的措施主要有___措施和个体防护措施两种。
【单选题】
二氧化碳气体保护焊时,由于氧气和紫外线作用强烈。适宜穿戴___
A. 亚麻工作服
B. 棉布工作服
C. 耐酸呢、柞丝绸等非棉布工作服
【单选题】
下列说法错误的是___
A. 从业人员对于安全的知情权,是保护劳动者生命健康权的重要前热
B. 从业人员有权了解其作业场所和工作岗位与安全生产有关的情况
C. 从业人员对本单位的安全生产工没有建议权
【单选题】
关于钎焊从业人员的义务,下列说法正确的是___
A. 从业人员必须接受专门的安全生产教育和业务培训
B. 从业人员一般不是事故隐患和不安全因素的第一当事人
C. 发现事故隐患和不安全因素后,没有及时报告,可自行处理
【单选题】
氩弧焊时,喷嘴过大会造成___
A. 易于焊工观察
B. 气流流速高
C. 挺度小
【单选题】
氧化焰可焊接的材料是___
A. 铝及铝合金、低碳钢、低合金钢
B. 黄铜、青铜
C. 镍、高碳钢、高速钢
【单选题】
埋弧焊熔炼焊剂名称中第一位数字表示焊剂中___
A. 硅的含量
B. 氧化锰的含量
C. 氟的含量
【单选题】
估算瓶内二氧化碳贮量的方法为___
A. 采用称钢瓶质量的办法
B. 采用气瓶压力表压力值的大小换算
C. 根据最大压力判断
【单选题】
关于短路过渡和颗粒过渡的说法,下列错误的是___
A. 短路过渡所使用的电流通常小于颗粒过度
B. 短路过渡所使用的电流通常大于颗粒过度
C. 短路过渡所使用的电压通常小于颗粒过度
【单选题】
关于铝及铝合金激光焊的说法,下列错误的是___
A. 焊缝中容易产生气孔
B. 工件表面需进行预处理,采用大功率的激光器
C. 工件表面在开始时反射率低且稳定
【单选题】
一般不发炎或化脓,但往往造成局部麻木和失去知觉的电击形式是___
【单选题】
以下说法错误的是___
A. 空载试验和短路试验拥有熔化焊机和简单测量装置即可测量
B. 在长期使用熔化焊机后应对次级回路进行清理和检测
C. 熔化焊机次级短路电流值,降低了焊机的焊接能力
【单选题】
与一般焊接相比,堆焊的基本规律与之不同,主要体现在其___
【单选题】
下送风式面罩又称为___
A. 头箍式头盔
B. 肩托式头盔
C. 风机内藏式头盔
【单选题】
固定式排烟罩的特点是___。
A. 适用于焊接大而长的焊件时排除电焊烟尘和有毒气体
B. 适合于焊接操作地点固定、焊件较小情况下采用
C. 可以根据焊接地点和操作位置的需要随意移动
【单选题】
焊接工作场所局部通风应用比较普遍的是___
A. 局部通风
B. 局部机械排气
C. 局部送风
【单选题】
关于氧化焰的说法,下列正确的是___
A. 火焰具有氧化性,过剩氧气会使熔池中合金元素烧损
B. 火焰中无过剩乙炔和氧
C. 火焰中乙炔过剩,含有游离碳和较多的氢。焊接低碳钢时焊缝会渗碳
【单选题】
为防止电渣焊时产生爆渣或漏渣引起的烧伤,应___
A. 选用氟化钙含量低的焊剂
B. 焊前检查变压器冷却水畅通情况
C. 提高装配质量
【单选题】
关于氧气管道的管材规定,下列正确的是___
A. 氧气管道的管材一般应选用无缝钢管、铜管(如黄铜管)
B. 不论架空或地沟敷设或埋设,一般工作压力在3Mha以者,多采用铜管（如黄铜管）
C. 工作压力在3Mpa以上者,多采用无缝钢管
【单选题】
二氧化碳气体预热器所使用的电压不得高于___V
【单选题】
氢气瓶是贮存和运输氢气的高压压力容器,瓶体表面为___
【单选题】
细丝(≤1.6mm)短路过渡焊接时的保护气体流量一般为___L/min。
【单选题】
关于隐弧排烟罩,下列说法正确的是___
A. 这类排烟罩适用于焊接大而长的焊件时排除电焊烟尘和有毒气体
B. 这类排烟罩对焊接区实行密闭,能最大限度地减少臭氧等有毒气体的弥散
C. 利用压缩空气从主管中高速喷出时,在副管形成负压区,从而将电焊烟尘和有毒气体吸出
【单选题】
用MU2-1000型悬臂式单头纵环缝带极埋弧堆焊机堆焊的设,其堆焊内径为最小___
【单选题】
下列可用于等离子焊接冷却系统中冷却剂是___
【单选题】
焊接作业时,丙烷瓶要远离火源___m以上
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【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
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He saw the publication of this book as an embarrassing invasion of his ___.
A. secret
B. privacy
C. private
D. piracy
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I think I would have died of ___.
A. embarrass
B. embarrassing
C. embarrassed
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He had an ___ at a restaurant in Greek Street at eight.
A. engagement
B. engage
C. contract
D. promise
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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
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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
【单选题】
She was so angry that she felt like ___ something at him.
A. to throw
B. to have thrown
C. throwing
D. having thrown
【单选题】
If you want to know the train schedule, please ___ at the booking office.
A. acquire
B. inquire
C. request
D. require
【单选题】
My brother’s plans are very ___; he wants to master English, French and Spanish before he is sixteen.
A. arbitrary
B. aggressive
C. ambitious
D. abundant
【单选题】
Housewives who do not go out to work often feel they are not working to their full ___.
A. capacity
B. strength
C. length
D. possibility
【单选题】
Water and air are ___ to human beings. We cannot live without them.
A. harbor
B. function
C. definite
D. essential
【单选题】
Our challenge is to ___ those voters and inspire them to join our cause.
A. motion
B. motive
C. motivate
D. motivation
【单选题】
Harper was a teacher by ___.
A. career
B. occupation
C. profession
D. vocation
