【单选题】
登高焊接与热切割作业是指焊工在坠落高度基准面___m以上
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相关试题
【单选题】
埋弧焊时,电弧的磁偏吹最小的电源是___
【单选题】
弧焊发电机出现电动机反转的原因是___电动机与电网接线错误。
【单选题】
弧焊机着火首先应___，然后再用灭火器灭火。
【判断题】
《安全生产法》规定,生产经营单位对重大危险源应当告知从业员和相关人员在紧急情况下应当采取的应急措施。
【判断题】
一般在动火前应采用一嗅、二看、三测爆的检查方法。
【判断题】
电弧辐射主要有紫外线、红外线和可见光三种射线,不会产生对人体危害较大的X射线等。
【判断题】
碳孤气刨时,应使用专用碳棒,以免产生过多有害气体。
【判断题】
为了确保氧气瓶的使用安全,出厂前要经受1.15倍瓶装压力的水压试验。
【判断题】
可燃性液体的闪点越低,其火灾危险性越小。
【判断题】
可燃气体钢瓶不许与氧气瓶同车装运或存放于同一库房。
【判断题】
氩弧焊时,电弧的辐射强度比焊条电弧焊强得多,因此,要加强防护措施。
【判断题】
如果需动火的设备处于禁火区内,必须按禁火区的动火管理规定申请动火证。
【判断题】
发生触电事故后,应立即切断事故发生场所电源开关或插头。
【判断题】
焊机长期超负荷运行或短路发热会使绝缘损坏而造成焊机漏电。
【判断题】
对于烧伤部位,可以将牙膏、油膏等油性物质涂于烧伤创面以减少创面污染的机会和减轻就医时处理的难度。
【判断题】
纯He气仅用于熔透法焊接,比如焊接铜。
【判断题】
凡与大地有可靠接触的金属导体,均可作为自然接地体。
【判断题】
MAG焊适用于碳钢、合金钢和不锈钢等黑色金属材料的全位置焊接。
【判断题】
铝热焊设备简单、投资少,焊接操作简便,无需电源。
【判断题】
二氧化碳焊可用于汽车、船舶、机车车辆、集装箱、矿山及工程 机械等。
【判断题】
脱离低压电源的方法可用"拉、切、挑、拽"四个字概括。
【判断题】
焊接不带电的金属外壳时,可以不采用安全防护措施。
【判断题】
钎焊作业的安全生产可以消除或控制危险、有害因素。
【判断题】
电子束焊焊接半镇静钢有时会产生气孔,降低焊接速度、加宽熔池有利于消除气孔。
【判断题】
只有将堆焊表面放在倾斜或立焊位置,才能不打渣连续堆焊。
【判断题】
激光切割时,工件和割矩只能有一方运动。
【判断题】
厚板的钨极氩弧焊一般要求填充金属的化学成分与母材不同。
【判断题】
维焊主要用于制造新零件与修复旧零件两个方面。
【判断题】
一辆小轿车上的焊点最多不能超过10000个。
【判断题】
表面堆焊可以采用二氧化碳气体保护焊方法焊接。
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I think I would have died of ___.
A. embarrass
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He had an ___ at a restaurant in Greek Street at eight.
A. engagement
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These companies often encounter many ___ impediments to investment.
A. invisible
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A. trailed
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I’m very sorry to have ___ you with so many questions on such an occasion.
A. offended
B. impressive
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It is sometimes difficult for young people from the countryside to ___ well to life in the big city.
A. suit
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Our guide gave us a detailed ___of this painting but we still do not understand.
A. authority
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If you want to ___ the wood, cut it with the grain, not against it.
A. break
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They have a stronger ___ of the importance of economic incentives.
A. appreciation
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C. conception
D. idea
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I believe I am capable of ___ the political consequences accurately.
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30 percent of reptiles, birds, and fish are currently ___ with extinction.
A. treated
B. threatened
C. danger
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Workers should occasionally walk around, ___ and avoid prolonged periods at the desk.
A. pull
B. lengthen
C. strain
D. stretch
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These companies often encounter many ___ impediments to investment.
A. invisible
B. edible
C. feasible
D. capable
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Running a kitchen ___a great deal of discipline and speed.
A. including
B. involving
C. involves
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He had an ___ at a restaurant in Greek Street at eight.
A. engagement
B. engage
C. contract
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I think I would have died of ___.
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He saw the publication of this book as an embarrassing invasion of his ___.
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A.
B. ecause B. Nevertheless
C. Hence
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Stratford police refuse to comment ___ whether anyone has been arrested.
A. about
B. on
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The world will be different, and we will have to be prepared to ___ to the change.
A. adopt
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The company has launched a campaign of television ___ and leaflets.
A. commercials
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The general secretary may ___ the president at official ceremonies.
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He ___ her arms behind her back and clipped a pair of handcuffs on her wrists.
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The picture exhibition bored me to death. I wish I ___ to it.
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An investigation was made into the accident ___ fifty people were killed.
A. for that
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___ with the picture, Mary tore it to pieces.
A. Dissatisfying thoroughly
B. Being thoroughly dissatisfied
C. To dissatisfy thoroughly
D. To be thoroughly dissatisfied
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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
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Housewives who do not go out to work often feel they are not working to their full ___.
A. capacity
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Water and air are ___ to human beings. We cannot live without them.
A. harbor
B. function
C. definite
D. essential
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Our challenge is to ___ those voters and inspire them to join our cause.
A. motion
B. motive
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Harper was a teacher by ___.
A. career
B. occupation
C. profession
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The doctor gave me a chest X-ray and ___some medicine for me.
A. prescribed
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C. drugged
D. drifted
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The list is arranged according to the ___ professions of the audience.
A. resolution
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【单选题】
The government is trying to do something to ___ better understanding between the two countries.
A. raise
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