问题
填空题
电场击穿时，发生（）电场（），电除尘器停止工作。
答案
参考答案：火花放电；短路
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电场击穿时，发生（）电场（），电除尘器停止工作。
参考答案：火花放电；短路
| 完形填空. | |||
| A friend of mine met with an accident driving in darkness.His legs were so hurt that he couldn't move.What was the worst was he found himself unable to ask for help-his mobile phone went out of __1__as a result of exhausted battery.Nothing could be done but to __2__in cold wilderness.It was 8 hours later that day broke,and then the __3__of the rescue. It was almost __4__that he could stand the horror in the darkness for so long.Even more surprising was his __5__:"First of all I checked up my physical conditions and found myself not in mortal (必死的) danger.As there was no __6__ to call for help,I leaned back in my seat trying my best to keep the wound from bleeding.In this way I dozed (打盹) off." His story put an end to my regret for the __7__of an exploration adventure that happened last year.A group of young men tried to explore a mountain cave and got lost.__8__ to find a way out in the dark cave.They were frightened and ran anxiously without a sense of __9__. Finally they fell dead in fear and exhaustion (筋疲力尽)．According to the __10__people that found them,the place where they got lost was only about 20 meters away from the __11__ of the cave.If they stayed on the spot when they lost their way and tried to __12__themselves, they would probably sense a faint light glimmering (闪烁) not far away. Don't you think that you can compare it with __13__itself? When you meet with obstacles in life and work,you are lost in darkness.__14__you it's unclear yet and you needn't put up struggle __15__.It seems to be a negative attitude,but a person who can afford to do so must have foresight as well as a great courage in the first place. | |||
| ( )1．A.service ( )2．A.cry ( )3．A.delay ( )4．A.untrue ( )5．A.plan ( )6．A.method ( )7．A.loss ( )8．A.Willing ( )9．A.hearing ( )10．A.rescue ( )11．A.end ( )12．A.save ( )13．A.adventure ( )14．A.Mind ( )15．A.really | B ．way B ．lie B ．success B ．unimaginable B ．decision B ．way B ．failure B ．Unable B ．sight B ．village B ．top B ．help B ．work B ．Watch B ．immediately | C．order C．wait C．team C．true C．explanation C．tools C．disappointment C．Determined C．feeling C．local C．opening C．stop C．life C．Imagine C．carefully | D．work D．sleep D．arrival D．useless D．excuse D．strength D．sadness D．Deciding D．direction D．brave D．side D．calm D．mankind D．Warn D．hopefully |