在气动避上限的自动回避临界转速回路中,若双气路控制的二位三通阀卡在上位(靠近控制端)

题型:单项选择题

问题:

在气动避上限的自动回避临界转速回路中,若双气路控制的二位三通阀卡在上位(靠近控制端),则可能产生的现象是()。

A.只能加速到临界转速上限值

B.只能加速到临界转速的下限值

C.实际转速在临界转速区

D.输出始终等于设定转速值

考点:船舶电气与自动化船舶主机遥控系统船舶主机遥控系统题库
题型:单项选择题

设全集U=R,集合A={x|x>-1},B={x|x>2},则A∩CUB=(  )

A.{x|-1≤x<2}

B.{x|-1<x≤2}

C.{x|x<-1}

D.{x|x>2}

题型:单项选择题

________is dangerous for us to swim in the river alone.

A.Anything

B.Something

C.Everything

D.Nothing

题型:单项选择题

阅读理解。

     I made a promise to myself on the way down to the vacation beach cottage. For two weeks I would

try to be a loving husband and father. Totally loving. No ifs, ands or buts.

     The idea had come to me as I listened to a talk on my car radio. The speaker was quoting a Biblical

passage about husbands and their wives. Then he went on to say, "Love is an act of will. A person can

choose to love." To myself, I had to admit that I had been a selfish husband. Well, for two weeks that

would change.

     And it did. On arriving at the beach cottage, I kissed Evelyn meeting me at the door and said, "That

new yellow sweater looks great on you." "Oh, Tom, you noticed", she said, surprised and pleased. Maybe

a little puzzled. After the long drive, I wanted to sit and read. Evelyn suggested a walk on the beach. I

started to refuse, but then I thought, "Evelyn's been alone here with the kids all week and now she wants

to be alone with me." We walked on the beach while the children flew their kites.

     So it went. Two weeks of not calling the Wall Street firm where I am a director; a visit to the shell

museum though I usually hate museums. Relaxed and happy, that's how the whole vacation passed. I

made a new promise to keep on remembering to choose love.

     There was one thing that went wrong with my experiment, however. Evelyn and I still laugh about

it today. On the last night at our cottage, preparing for bed, Evelyn stared at me with the saddest

expression.

     "What's the matter?" I asked her.

     "Tom," she said in a voice filled with distress, "I don't?"

     "What do you mean?"

     "Well…that checkup I had several weeks ago…our doctor…did he tell you something about me?

Tom, you've been so good to me…am I dying?"

     It took a moment for it all to be understood. Then I burst out laughing.

     "No, honey," I said, wrapping her in my arms. "You're not dying; I'm just starting to live."

1. From the story we may infer that Tom drove to the beach cottage _____. [ ]

A. with his family

B. with Evelyn

C. alone

D. with his children

2. During the two weeks on the beach, Tom showed more love to his wife because _____. [ ]

A. he was determined to be a good husband

B. he had made a lot of money in his Wall Street firm

C. she looked lovely in her new clothes

D. the doctor said his wife was seriously ill

3. The author says, "There was one thing that went wrong with my experiment." What does "one thing"

     refer to? [ ]

A. He praised her sweater, which puzzled her.

B. She insisted on visiting a museum, which he hated.

C. He knew something about her illness but didn't tell her.

D. He was so good to her that she thought she must be dying.

4. By saying "I'm just starting to live," Tom means that _____. [ ]

A. he is just beginning to understand the real meaning of life

B. he is just beginning to enjoy life as a loving husband

C. he lived an unhappy life before and is now starting to change

D. he is beginning to feel regret for what he did to his wife before

题型:单项选择题

新生儿肺透明膜病(neonatalrespiratorydistresssyndrome)

题型:单项选择题

在商法理论上,小商人一般包括( )。

A.从事小规模营业活动的完全商人

B.承担有限责任的商合伙

C.商自然人

D.小规模的有限责任公司

E.完全商人

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