晶管型继电器和整流型继电器相比较,在构成原理上有什么不同?

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问题:

晶管型继电器和整流型继电器相比较,在构成原理上有什么不同?

考点:继电保护工考试继电保护中级工继电保护中级工题库
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请你写出两个多项式,它们的乘积是2x2-8y2,这两个多项式分别是______、______,(写出一种情况即可).

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二战后的美国某总统在其回忆录中写到:“我也希望(藉此机会)向全世界说明,美国在这个新的极权主义的挑战面前所持的立场。我相信,这是美国外交政策的转折点,它现在宣布。不论什么地方,不论直接或间接侵略威胁了和平,都与美国的安全有关”。美国的这个政策主要针对哪个国家?

A.德国

B.苏联

C.日本

D.英国

题型:问答题 简答题
On receiving my learner driver license a couple of months ago, I started driving lessons straight away. In New Zealand, the __33__driving age is 15.
However it wasn’t __34__ two days ago that Dad finally allowed me to drive on the motorway. Our __35__ was Orewa, a seaside town about 60 kilometers away from my home in Auckland. That morning I __36__ sure I had enough to drink and went to the toilet (厕所) about three times __37__ we left. I thought I was totally __38__ for the journey, but nothing could have prepared me for my family’s __39__. "Relax! Don’t hold the steering wheel(方向盘) so __40__. The car is going zigzag (弯弯曲曲的)," called a nervous voice from the __41__. "Speed up. 70km/h isn’t fast enough. You are holding up the traffic," another voice ordered from the seat next to mine.
How __42__ ! My parents were really starting to get on my nerves. To satisfy them I sped up and within a second, an angry voice began to yell again. "Stop! __43__! Are you crazy? ” Everything did not go fine until I pulled off the motorway and drove into the city, __44__ the speed limit was only 50km/h.
My family seemed relieved (放心的) and __45__ telling me what to do. They all looked out of the windows and enjoyed the scenery .  __46__, that silence didn’t last very long. My mum suddenly cried out, "Look at those birds above us. __47__ they lovely?"
How did she expect me to look up in the __49__? As the driver I had to __48__ . Who knows what would have happened if I had taken my eyes off the __50__? Four hours later we drove home. This time the journey was much __51__ than before as everyone else __52__ fast asleep. So, I just took my time and enjoyed the drive.
小题1:
A.oldestB.youngestC.bestD.worst
小题2:
A.untilB.unlessC.afterD.when
小题3:
A.destinationB.homeC.cityD.aim
小题4:
A.thoughtB.decidedC.keptD.made
小题5:
A.whenB.sinceC.beforeD.as
小题6:
A.disappointedB.preparedC.excitedD.upset
小题7:
A.praisesB.encouragementsC.complaintsD.cries
小题8:
A.tightlyB.lightlyC.loosely D.happily
小题9:
A.front searB.back seatC.top seatD.empty seat
小题10:
A.interestingB.movingC.puzzlingD.annoying
小题11:
A.Get outB.Move onC.Slow down D.Speed up
小题12:
A.whereB.whileC.whichD.why
小题13:
A.began B.stoppedC.continuedD.forgot
小题14:
A.LuckilyB.ProbablyC.WarmlyD.Sadly
小题15:
A.Can’tB.Don’tC.Aren’tD.Won’t
小题16:
A.airB.waterC.groundD.woods
小题17:
A.seeB.concentrateC.checkD.care
小题18:
A.birdB.dogC.roadD.car
小题19:
A.easierB.flatterC.harderD.lower
小题20:
A.feltB.beganC.fellD.kept
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下列正确的文件名是()。

A.VI!A、AVI

B.CE#D、EXE

C.L@CD、SYS

题型:问答题 简答题

在化工、医药等方面使用较多,耐蚀性能强,可用于输送硫酸、二氧化硫、氢氟酸、醋酸,但不能输送硝酸、次氯酸、高锰酸钾及盐酸的有色金属管是( )。

A.铅管

B.铜管

C.铝管

D.钛管

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