手工电弧焊常坡口的基本形式有()双V形、双Y形、双U形坡口带钝边等。 A.I形 B.

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问题:

手工电弧焊常坡口的基本形式有()双V形、双Y形、双U形坡口带钝边等。

A.I形

B.V形

C.U形

D.Y形

考点:中级电焊工考试中级电焊工考试题库
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读句子,选择恰当的介词填空。
at    with    to    for
1. I am writing a letter _________ my father. 
2. Let me show the camera _________ you. 
3. I want to buy a shirt _________ my father. 
4. Let me make a kite _________ you. 
5. I write _________ a pen. 
6. I can buy stamps _________ the post office.
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在液压传动系统中,因为活塞的运动速度可以通过改变流量的方式进行调节,所以,液压传动可以实现无级变速。

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市场失灵的表现

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An eight-year-old child heard her parents talking about her little brother. All she knew was that he was very sick and they had no money left. When she heard her daddy say to her (1) mother," (2) a miracle can save him now", the little girl went to her bedroom and took out her piggy bank. She (3) all the change out on the floor and counted it carefully. Then she (4) her way six blocks to the drugstore.

"And what do you want" asked the shopkeeper. "It’s (5) my little brother," the girl answered back. "He’s really, really sick and I want to buy a (6) . His name is Andrew and he has something (7) growing inside his head and my daddy says only a miracle can save him. " "We don’t (8) miracles here, child. I’m sorry." the chemist said, smiling (9) at the little girl.

In the shop was a (10) customer. He stooped down and asked the little girl, "What kind of miracle does your brother (11) " "I don’t know," she replied. "He’s really sick and mommy says he needs (12) . But my daddy can’t pay for it, so I have brought my (13) .""How much do you have" asked the man. "One dollar and eleven cents, (14) I can try and get some more," she answered quietly. "Well, what a coincidence," smiled the man. "A dollar and eleven cents—the (15) price of a miracle for little brothers. (16) me to where you live. I want to see your brother and (17) your parents. "

That well-dressed man was Dr Carlton Armp, a doctor. The operation was completed without any (18) and it wasn’t long before Andrew was (19) again. The little girl was happy. She knew exactly how much the miracle cost—one dollar and eleven cents—also the (20) of a little child.

15()

A.same

B.exact

C.proper

D.necessary

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辐射对人体健康有何种危害?

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