三相势头笼式异步电动机定子绕组是三相对称的,各相绕组彼此互差()的电角度。 A.60

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问题:

三相势头笼式异步电动机定子绕组是三相对称的,各相绕组彼此互差()的电角度。

A.600

B.900

C.1200

D.1800

考点:初级维修电工初级维修电工题库
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横截面的直径为d、长为l的导线,两端电压为U,当这三个量中一个改变时,对自由电子定向运动的平均速率的影响是(  )

A.电压U加倍,自由电子定向运动的平均速率不变

B.导线长度l加倍,自由电子定向运动的平均速率加倍

C.导线横截面的直径加倍,自由电子定向运动的平均速率不变

D.以上说法均不正确

题型:单项选择题
Frank told us of his childhood. “My dad was a fisherman, and he 36   the sea. It was    37  making a living on the sea. He worked hard and would stay out    38   he caught enough to feed the family.”
“He was a big man, and was   39   from pulling the nets and fighting the seas. When you got close to him, he smelled like the    40  . No matter how much my mother    41   his clothes, they would    42   smell of fish.”
“Every day he drove me to school. When the old truck rattled (嘎嘎作响) down the road, I would shrink down into the seat hoping to    43  . When we reached school, he would give me a kiss on the cheek and    44  me to be a good boy. It was so embarrassing for me. I was    45   twelve years old!”
“I    46   the day I decided I was too old for a goodbye kiss. When he started to lean toward me, I put my hand up and said, ‘No, Dad.’ It was the first time I had ever talked to him in that   47  , and he had this    48   look on his face. I said, ‘Dad, I’m too old for a goodbye kiss.’ My dad looked at me and his eyes were filled with tears. I had never seen him    49  . ‘You’re right,’ he said. ‘You are a big boy...a man. I won’t    50   you any more.’”
   51   began to well up in Frank’s eyes, “It wasn’t long after that when my dad went to sea and never came back.    52   of the boats stayed in that day because of a coming storm, but not dad. He had a big family to    53  .”
“Guys, you don’t know what I would like is to have my dad give me just one more kiss on the cheek, to feel his    54  old face, to smell the ocean on him. I wish I had been a man then.   55   I had been a man, I would never have told my dad I was too old for a goodbye kiss.”
小题1:
A.hatedB.lovedC.ownedD.sold
小题2:
A.hard B.enjoyableC.easyD.comfortable
小题3:
A.beforeB.afterC.untilD.unless
小题4:
A.thinB.fatC.weakD.strong
小题5:
A.oceanB.landC.skyD.animals
小题6:
A.madeB.washedC.changedD.bought
小题7:
A.neverB.seldomC.stillD.ever
小题8:
A.surviveB.disappearC.succeedD.appear
小题9:
A.forceB.adviseC.orderD.tell
小题10:
A.sometimesB.onceC.already D.only
小题11:
A.rememberB.forgetC.recognizeD.forecast
小题12:
A.voiceB.wayC.caseD.attitude
小题13:
A.tiredB.surprisedC.worriedD.annoyed
小题14:
A.smileB.singC.sighD.cry
小题15:
A.kissB.cheatC.punishD.beat
小题16:
A.FearB.TearsC.BloodD.Anger
小题17:
A.BothB.NoneC.MostD.Few
小题18:
A.blameB.holdC.rescueD.feed
小题19:
A.smoothB.dirtyC.roughD.clean
小题20:
A.IfB.WhenC.WhetherD.Where
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炸花生仁如果用连衣直接炸法,炸制时油温为()

A.155~160℃

B.125~130℃

C.105~110℃

D.95~100℃

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马蹄肾

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6LS采煤机,3#灯亮表示()继电器接点闭合;24#灯亮表示PR接点闭合。

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