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【填空题】
in sb. 's words,count on,make sense of ,reserve for, shield from,call on, sum up, relate to ,in need, be/ get caught up in My most favorite program is the one that deals with scientific subjects that ordinary people can [ ]
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relate to
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【填空题】
in sb. 's words,count on,make sense of ,reserve for, shield from,call on, sum up, relate to ,in need, be/ get caught up in Finally, I would like to [ ]by saying that it has been a tremendous pleasure to work with you all
【填空题】
in sb. 's words,count on,make sense of ,reserve for, shield from,call on, sum up, relate to ,in need, be/ get caught up in He is a person that you always [ ]when you need help.
【填空题】
in sb. 's words,count on,make sense of ,reserve for, shield from,call on, sum up, relate to ,in need, be/ get caught up in This restaurant is very popular because it has some separate, smaller rooms [ ] families with small children
【填空题】
in sb. 's words,count on,make sense of ,reserve for, shield from,call on, sum up, relate to ,in need, be/ get caught up in Betty loves reading.[ ],“Reading is the most wonderful thing in the world.”
【填空题】
open the door to,In advance,all at once,reap the benefits (of), make the most of,over time, get by, stand a chance (of),remind of, take pleasure in, Every one of you has made a contribution and I [ ] knowledging what each of you has done to make this academic convention such a success.
【填空题】
open the door to,In advance,all at once,reap the benefits (of), make the most of,over time, get by, stand a chance (of),remind of, take pleasure in They all tried to talk [ ], but I couldn't hear anything they said
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open the door to,In advance,all at once,reap the benefits (of), make the most of,over time, get by, stand a chance (of),remind of, take pleasure in, Yellow flowers in the field always [ ] me [ ] my childhood in the countryside
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open the door to,In advance,all at once,reap the benefits (of), make the most of,over time, get by, stand a chance (of),remind of, take pleasure in, We have been practicing for so long and so hard that our team should [ ]winning the game
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open the door to,In advance,all at once,reap the benefits (of), make the most of,over time, get by, stand a chance (of),remind of, take pleasure in, Research on genes will [ ] exciting new medical treatments.,
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open the door to,In advance,all at once,reap the benefits (of), make the most of,over time, get by, stand a chance (of),remind of, take pleasure in, My family [ ] on my father's unemployment benefit after he lost his job
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open the door to,In advance,all at once,reap the benefits (of), make the most of,over time, get by, stand a chance (of),remind of, take pleasure in, Many subway riders read books or listent music in order to [ ] their time on the way to work
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open the door to,In advance,all at once,reap the benefits (of), make the most of,over time, get by, stand a chance (of),remind of, take pleasure in, In order to make sure he would be able to attend the meeting, I called him up two weeks [ ]
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open the door to,In advance,all at once,reap the benefits (of), make the most of,over time, get by, stand a chance (of),remind of, take pleasure in, In order to [ ]physical exercise, you have to exercise regularly and for at least half an hour each time
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embarrass,polish, emotional, etticiency,curb ,await, donation ,dump,stuff ,historical Mary was a careful speaker, every word seemed to have been [ ] before it was allowed to escape through her lips
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embarrass,polish, emotional, etticiency,curb ,await, donation ,dump,stuff ,historical He has a special feeling for the brilliant birds, and each spring he eagerly [ ] their return
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embarrass,polish, emotional, etticiency,curb ,await, donation ,dump,stuff ,historical Thanks to the [ ] of air transport,everyone is free to go anywhere at any time
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embarrass,polish, emotional, etticiency,curb ,await, donation ,dump,stuff ,historical John believes that the [ ] of food to the hungry is more helpful than giving money
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embarrass,polish, emotional, etticiency,curb ,await, donation ,dump,stuff ,historical When she heard it was snowing in the city they were going to, she [ ] two more sweaters into her bag.
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embarrass,polish, emotional, etticiency,curb ,await, donation ,dump,stuff ,historical During our stay in Europe we visited many places of [ ] interest, including several castles
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embarrass,polish, emotional, etticiency,curb ,await, donation ,dump,stuff ,historical The wedding ceremony of my sister was a very [ ] experience for our family
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embarrass,polish, emotional, etticiency,curb ,await, donation ,dump,stuff ,historical He was [ ]when he discovered that he didn't have enough money to pay for the red wine he had ordered
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embarrass,polish, emotional, etticiency,curb ,await, donation ,dump,stuff ,historical The local government is pressed to find new places to [ ] dump waste
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embarrass,polish, emotional, etticiency,curb ,await, donation ,dump,stuff ,historical The new system designed to [ ] harmful emissions排放物) from factories will be put into use soon
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explore ,transmit, resource, emerge,yield, pose, assume, confidence,inherit, comprehensive It is so difficult to [ ] the bottom of the ocean because some parts are very deep.
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explore ,transmit, resource, emerge,yield, pose, assume, confidence,inherit, comprehensive It was about 30 seconds before Alex [ ] from the water, we were quite scared
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explore ,transmit, resource, emerge,yield, pose, assume, confidence,inherit, comprehensive We often [ ] that when other people do the same things as we do, they do them,for the same reasons; but this assumption is not always reasonable
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explore ,transmit, resource, emerge,yield, pose, assume, confidence,inherit, comprehensive There is widespread concern that the rising unemployment may [ ] a threat to social stability.
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explore ,transmit, resource, emerge,yield, pose, assume, confidence,inherit, comprehensive After a(n) [ ] physical exam, my doctor said I was in good condition except that my blood pressure was a little high
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explore ,transmit, resource, emerge,yield, pose, assume, confidence,inherit, comprehensive 7 It is well known that China is a country with rich natural [ ] and a very big population.
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explore ,transmit, resource, emerge,yield, pose, assume, confidence,inherit, comprehensive Some people believe that the earth can [ ] enough food to support at least twice its present population
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explore ,transmit, resource, emerge,yield, pose, assume, confidence,inherit, comprehensive Sam [ ] the gift of imagination from his family, but he lacked the driving power to take action
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explore ,transmit, resource, emerge,yield, pose, assume, confidence,inherit, comprehensive A bee that has found honey is able to [ ] to other bees the information they need in order to collect the honey
【单选题】
在___时间内电流所做的功叫做电功率。P8T40
A. 规定
B. 标称
C. 单位
【单选题】
对单匝线圈来说,其产生的磁通与流过线圈电流的比值叫该线圈的___,也叫电感,用L表示。P11T54
A. 自感系数
B. 磁通
C. 电流
【单选题】
电器的触头系统属于电器的___P15T82。
A. 感测机械
B. 执行机构
C. 保护机械
【单选题】
触头按工作性质分为静触头和___。P16T83
A. 主触头
B. 辅助触头
C. 动触头
【单选题】
直流发电机励磁绕组与电枢绕组不相连,励磁电流由另一个独立电源供电,这样的发电机为___。P18T93
A. 并励发电机
B. 他励发电机
C. 串励发电机
【单选题】
由两以上匝数不同的线圈绕在一个构成闭合回路的铁心上组成的电气装置是___P19T100 。
A. 变压器
B. 接触器
C. 继电器
【单选题】
使用万用表选用量程时,应尽可能使表针移动至满刻度的___左右为宜。P20T102
A. 1/3
B. 1/2
C. 2/3
【单选题】
各相绕组的首端与首端之间的电压称___。P20T104
A. 线电压
B. 相电压
C. 过电压
推荐试题
【判断题】
在中厚板零件的焊接过程中,焊缝往往采用多层焊或多层多道焊完成
A. 对
B. 错
【判断题】
电弧焊机按焊接方法可分为焊条电弧焊机、埋弧焊机、CO2 气体保护焊机、钨极氩弧焊机、熔化极氩弧焊机和等离子弧焊机
A. 对
B. 错
【判断题】
电弧焊机按焊接自动化程度可分为手工电弧焊机、半自动电弧焊机和自动电弧焊机
A. 对
B. 错
【判断题】
电焊机型号BX1—300:B 表示整流弧焊机,X表示下降特性,1表示静铁芯式,300表示额定电流为300A
A. 对
B. 错
【判断题】
为满足大范围的均匀调速和送丝速度的快速响应,一般采用直流伺服电动机驱动。送丝系统有推丝式和拽丝式两种送丝方式
A. 对
B. 错
【判断题】
为了获得稳定的焊接过程,需要合理选择焊接规范参数如电流、电压及焊接速度等,并且保证参数在焊接过程中稳定
A. 对
B. 错
【判断题】
CO2 气瓶灌入的是液态 CO2,在室温下,瓶内剩余空间被汽化的 CO2 充满,饱和压力达到 20 MPa 以上
A. 对
B. 错
【判断题】
减压表用以减压和调节保护气体压力,流量计是标定和调节保护气体流量,两者联合使用,使最终焊枪输出的气体符合焊接规范要求
A. 对
B. 错
【判断题】
气体从气瓶增压输出后,流过电磁气阀,通过橡胶或塑料制软管,进入焊枪,最后由喷嘴输出,把电弧区域的空气机械排开,起到防止污染的作用
A. 对
B. 错
【判断题】
CO2 气体保护焊是一种用 CO2液体作为保护熔化极的电弧焊方法
A. 对
B. 错
【判断题】
CO2 气体保护焊主要用于焊接低碳钢及低合金高强钢,也可以用于焊接耐热钢和不锈钢,可进行自动焊及半自动焊
A. 对
B. 错
【判断题】
钨极氩弧焊是以钨棒作为电弧的一极的电弧焊方法,钨棒在电弧焊中是不熔化的,故又称不熔化极氩弧焊,简称 TIG焊
A. 对
B. 错
【判断题】
由于被惰性气体隔离,焊接区的熔化金属不会受到空气的有害作用,所以钨极氩弧焊可用以焊接易氧化的有色金属如铝、镁及其合金
A. 对
B. 错
【判断题】
埋弧焊电弧产生于堆敷了一层的焊剂下的焊丝与零件之间,受到熔化的焊剂——熔渣以及金属蒸汽形成的气泡壁所包围
A. 对
B. 错
【判断题】
相比焊条电弧焊,埋弧焊的主要优点:焊接电流和电流密度大,生产效率高,是手弧焊生产率的 50~100 倍
A. 对
B. 错
【判断题】
埋弧焊自动化水平高,但有弧光辐射,工人劳动条件不好
A. 对
B. 错
【判断题】
埋弧焊不受到焊剂敷设限制,可以用在空间位置焊缝的焊接
A. 对
B. 错
【判断题】
由于埋弧焊焊剂的成分主要是 MnO 和 SiO2 等金属及非金属氧化物,适合焊铝、钛等易氧化的金属及其合金
A. 对
B. 错
【判断题】
埋弧焊在中、厚板对接、角接接头有广泛应用,14 mm以下板材对接可以不开坡口。埋弧焊也可用于合金材料的堆焊上
A. 对
B. 错
【判断题】
等离子弧按电源供电方式不同,分为两种形式
A. 对
B. 错
【判断题】
非转移型等离子弧:电极接电源正极,喷嘴接负极,而零件不参与导电。电弧是在电极和喷嘴之间产生
A. 对
B. 错
【判断题】
转移型等离子弧: 钨极接电源负极,零件接正极,等离子弧在钨极与零件之间产生
A. 对
B. 错
【判断题】
A. 对
B. 错
【判断题】
气焊是利用气体火焰加热并熔化母体材料和焊丝的焊接方法
A. 对
B. 错
【判断题】
气焊常用于薄板的低碳钢、低合金钢、不锈钢的对接、端接,在熔点较低的铜、铝及其合金的焊接中仍有应用
A. 对
B. 错
【判断题】
中性焰是当氧气与乙炔的混合比为 1~1.2 时,燃烧充分,燃烧过后无剩余氧或乙炔,热量集中,温度可达 2050℃~2150℃
A. 对
B. 错
【判断题】
中性焰焰心是呈亮白色的圆锥体,温度较低;内焰呈暗紫色,温度最高,适用于焊接;外焰颜色从淡紫色逐渐向橙黄色变化,温度下降,热量分散
A. 对
B. 错
【判断题】
碳化焰是指当氧气与乙炔的混合比小于 1 时,部分乙炔未曾燃烧,焰心较长,呈蓝白色,温度最高达 2700℃~3000℃
A. 对
B. 错
【判断题】
氧化焰是指当氧气与乙炔的混合比大于 1.2时,燃烧过后的气体仍有过剩的氧气,焰心短而尖,内焰区氧化反应剧烈,火焰挺直发出“嘶嘶”声,温度可达 2100℃~2300℃
A. 对
B. 错
【判断题】
氧化焰由于火焰具有氧化性,焊接碳钢易产生气体,并出现熔池沸腾现象,很少用于焊接
A. 对
B. 错
【判断题】
电阻焊是将零件组合后通过电极施加压力,利用电流通过零件的接触面及临近区域产生的电阻热将其加热到熔化或塑性状态,使之形成金属结合的方法
A. 对
B. 错
【判断题】
点焊方法:将零件装配成搭接形式,用电极将零件夹紧并通以电流,在电流热作用下,电极之间零件接触处被加热熔化形成焊点
A. 对
B. 错
【判断题】
凸焊 是电加热后突起点被压塌,形成焊接点的电阻焊方法
A. 对
B. 错
【判断题】
对焊工作原理:将两零件端部相对放置,加压使其端面紧密接触,通电后利用电阻热加热零件接触面至塑性状态,然后迅速施加大的顶锻力完成焊接
A. 对
B. 错
【判断题】
电渣焊是一种利用电流通过液体熔渣所产生的电阻热加热熔化填充金属和母材,以实现金属焊接的熔化焊接方法
A. 对
B. 错
【判断题】
电渣焊适用于厚板、大断面、曲面结构的焊接,如火力发电站数百吨的汽轮机转子、锅炉大厚壁高压汽包等
A. 对
B. 错
【判断题】
激光焊是利用大功率相干单色光子流聚集而成的激光束为热源进行焊接的方法
A. 对
B. 错
【判断题】
焊接时,焊件仅在局部区域被加热到高温,离焊缝愈远,温度愈高,膨胀也愈大
A. 对
B. 错
【判断题】
焊接产生拉应力和压应力,当这些应力超过金属的强度极限时,将产生焊接变形;当超过金属的屈服极限时,则会出现裂缝
A. 对
B. 错
【判断题】
未焊透是指工件与焊缝金属或焊缝层间局部未熔合的一种缺陷
A. 对
B. 错
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